Air Conditioning, Cleaning of the R1234yf Refrigerant Circuit (U.S. Only) – 2018-2019 Volkswagen

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Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 1 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Condition
Applicable Vehicles
Model(s)
Year
Eng. Code
Trans. Code
VIN Range From
VIN Range To
All Models
2018-2019
All
All
All
All
Revision Table
Instance Number
Published Date
Version Number
Reason For Update
2049039/4
6/14/19
87-18-08
Update to vehicle metadata selection.
2049039/3
5/28/19
87-18-08
To update special tool part number in step 26 to 6338/48.
2049039/2
8/1/18
V871808
To include new model year and to add tool adaptor 6338/18.
2049039/1
11/9/17
V871713
Original publication.
Debris can be dispersed throughout the refrigerant circuit after A/C component damage. In order to maintain A/C operating efficiency, it is important to flush the refrigerant circuit after A/C component repairs.
Note:
This bulletin must be read in its entirety before beginning repair.
Technical Background
In cases where an air conditioning system component (such as a compressor or other system component) has failed and debris from the compressor or component is circulated throughout the refrigerant circuit, the refrigerant circuit must be cleaned of any and all debris or damage to the replacement components will result.
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 2 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Production Solution
No production change required.
Service
Tools
Figure 1. The VAS581005 Air Conditioning Service System with Flushing Device.
Use the MAHLE R1234yf A/C Service Unit VAS581005 and the R1234yf Flush Kit RTI360831040 (Figure 1).
Used for effective refrigerant handling and air conditioning circuit flushing after air conditioning component failure.
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 3 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
The VAS 6338/1 Adapter Set for Refrigerant Circuits along with an additional adapter VAS 6338/38 for
the expansion valve bypass this kit, contains the adapters necessary to complete a thorough flush
operation of a contaminated circuit.
Elsa contains the technical information for each model regarding the necessary adapter
applications and connections of the servicing station for the flush operation. See Heating,
Ventilation & Air Conditioning >> Refrigerant R1234yf-Servicing >> 00 General Technical Data>>
Refrigerant Circuit removing contaminates>> Refrigerant Circuit, Flushing with Refrigerant
R1234yf in Elsa.
All other refrigerant recovery, evacuation and recharge operations are performed using the usual
procedure specified in Elsa. An operations manual will accompany each servicing station that will
describe operation of the unit.
Procedure
Front A/C:
1. If an air conditioning component has been diagnosed as the root cause of the failure, and this particular
component has been verified to have released debris through the circuit, continue with the flush
procedure.
2. Switch the power to the servicing station ON and begin by recovering the refrigerant from the system
through the normal service fittings.
Note:
For all compressor replacements it is mandatory to flush the system of all oil in the system. The
replacement compressor comes with a full charge of oil for a complete A/C system.
Tip:
During the entire process avoid interrupting the power to the station. The station’s internal memory will
keep a log of all operations and can conveniently be recalled and printed. If the power is interrupted, the
station will lose the memory of the process, and the oil volume recovered, oil volume added, refrigerant
volume recovered, etc. will have to be manually determined.
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 4 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
3. Disconnect the service hoses from the AC service ports of the refrigerant circuit.
The VAS 6338/1 adapters will be used to bypass the following:
 Compressor.
 Expansion Valve.
 Rear AC lines to rear AC unit (If Equipped)
 Rear AC unit Expansion Valve (If Equipped)
Note:
For models with receiver drier desiccant cartridge the desiccant cartridge must be removed for the flushing process.
For vehicles where the receiver drier is located on the condenser and DOES NOT have a remove-able desiccant cartridge, the receiver drier must be left in the system and flushed through.
After the flush procedure is complete replace the receiver drier or drier cartridge.
4. Installing the R1234yf Flush Kit RTI360831040 flush tank to the Mahle A/C Service Unit VAS581005
5. Remove Receiver Drier. Refer to Elsa Repair Manual.
Note:
For Atlas, the front bumper does not need to be removed as stated in the Elsa repair manual.
When removing front grille ensure ignition is switched OFF and negative battery cable is disconnected before disconnecting the front distance regulation module.
Figure 2. Location of the Receiver Drier
6. Remove receiver drier cartridge.
Reinstall cartridge cap with O-ring. (Figure 2)
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 5 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Figure 3. Installation of front expansion valve bypass adaptor VAS 6338/38.
7. Remove expansion valve and install flush plate VAS 6338/38. (Figure 3)
Figure 4a. Installation of high side rear A/C Line connection block adaptor VAS 6338/63
Note:
(Atlas Only) The rear A/C unit refrigerant lines must be disconnected and replaced with block off adaptors VAS 6338/5 and VAS 6338/63 before performing the front A/C unit flush procedure.
8. (Atlas Only) Disconnect rear refrigerant lines and install adaptors VAS 6338/5 and VAS 6338/63 as shown. (Figure 4a, 4b)
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 6 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Figure 4b. Installation of Low side rear A/C Line connection block adaptor VAS 6338/5
Figure 5. A.C hose adaptor 6338/44
9. Remove A/C Recovery machine high side coupler from hose.
Install flush adaptor VAS 6338/48 to high side A/C recovery machine hose. (Figure 5)
Note:
You do not have to remove low side A/C hose coupler. The low side coupler will be connected to the flush tank filter adaptor.
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 7 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Figure 6. Installation of VAS 6338/3 and 6338/12.
10. Disconnect AC compressor hoses from the compressor.
Install flush adaptor VAS 6338/3 on the high side compressor hose.
Install flush adaptor VAS 6338/12 on low side compressor hose. (Figure 6)
Figure 7.
11. Attach high side A/C Recovery machine hose with VAS 6338/48 fitting to low side compressor hose adaptor VAS 6338/12. (Figure 7)
Note:
This connection strategy allows for a system flush in the opposite direction of the normal refrigerant flow.
Figure 8.
12. Connect the low side A/C machine coupler to the flush tank filter adaptor. (Figure 8)
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 8 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Figure 9.
13. Connect flush tank hose (Yellow) to the high side compressor hose adaptor VAS 6338/3. (Figure 9)
14 Perform an extended 3 cycle flush.
15. After the flush process completes remove any adapters that were installed from the VAS 6338/1.
16. (Atlas Only) Proceed to section for cleaning the rear A/C unit. All others models continue to step 17.
17. Install a new Expansion Valve and Receiver Drier Cartridge. Reassemble all refrigerant lines.
18. Print the extended flush log of the job and attach to the repair order.
19. Connect the station in the usual manner through the service fittings and perform the normal evacuation and refrigerant recharge operations.
Note:
For Atlas a rear A/C unit flush must be performed before vacuum testing and recharging.
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 9 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Atlas Rear A/C Unit
The flush process will be repeated for the additional rear air conditioning unit according to the repair information in Elsa.
Figure 10.
20. Lower the exhaust buy removing the rear exhaust clamp and single rubber hanger. (Figure 10)
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 10 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Figure 11.
21. Remove the cross bar located in the center under carriage area. (Figure 11)
Figure 12.
22. Remove middle heat shield from under previously removed cross bar to access rear expansion valve. (Figure 12)
Note:
Replace the clamping washer before reinstalling the heat shield.
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 11 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Figure 13. Location of rear air conditioning unit expansion valve.
23. Remove rear expansion valve and install VAS6338/38 as shown. (Figure 13)
24. Connect the VAS 6338/3 and VAS 6338/60 to the rear refrigerant A/C lines previous disconnected in step 12. (Figure 14)
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 12 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Figure 14. Location and connection of the adaptors for the rear unit A/C lines
25. Connect the VAS 6338/3 and VAS 6338/60 to the rear refrigerant A/C lines.
26. Connect the VAS 6338/48 to adaptor VAS 6338/60
27. Connect flush tank hose (Yellow) to the high side compressor hose adaptor VAS 6338/3. (Figure15)
Note:
Reverse flushing not required for rear A/C unit cleaning.
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 13 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Figure 15. Attaching service station and flush hoses to rear A/C lines.
28. Perform an extended 3 cycle flush on the rear A/C unit.
29. When complete, remove any adapters that were installed from the VAS 6338/1.
30. Install a new rear Expansion Valve and reinstall all the refrigerant lines.
31. Connect the station in the usual manner through the service fittings and perform the normal evacuation and refrigerant recharge operations.
32. Print the extended flush log of the job and attach to the repair order.
33. Connect the station in the usual manner through the service fittings and perform the normal evacuation and refrigerant recharge operations
A/C Components Replacement
The following components must be replaced:
 Expansion Valve
 Rear Expansion Valve (If equipped)
 Receiver-drier/cartridge
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 14 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Warranty
Note:
The procedure outlined in this Technical Bulletin must be included with the warranty repair(s) and not claimed independently.
You may claim $8.50 per A/C System flush for the A/C System Flush filter 0268056100 (which represents 1/5 the cost of a replacement filter)
A print out from the Mahle A/C Service Station of the flush procedure must be attached to the warranty claim.
To determine if this procedure is covered under Warranty, always refer to the Warranty Policies and Procedures Manual 1)
Model(s)
Year(s)
Eng. Code(s)
Trans. Code(s)
VIN Range From
VIN Range To
All Models
2018-2019
All
All
All
All
SAGA Coding
Claim Type:
Use applicable Claim Type 1)
Service Number:
Damage
Code
HST
Damage Location (Depends on Service No.)
Parts Manufacturer
(removed part)
Use Service Number of Defective Component
Use damage code appropriate for root cause of failure
—
Use applicable when indicated in Elsa (L/R)
Use Vendor code from failed component
_ _ _2)
Labor Operation 3) : Refrigerant drain and fill
(Except Atlas)
8703XXXX = Claim appropriate SRT for vehicle and engine in Elsa
Labor Operation 3): Air Conditioner Check, All Vehicles. (Except Atlas)
87010150 = See Elsa for the latest time units
Labor Operation 3): Air Conditioner Clean, All Vehicles, Front A/C only (except Atlas)
87012999 = 110 TU
Labor Operation 3): Replace Receiver-Drier (Except Atlas)
8755XXXX = Claim appropriate SRT for vehicle and engine in Elsa
Labor Operation 3): Replace Expansion Valve, if equipped. (Except Atlas)
8770XXXX = Claim appropriate SRT for vehicle and engine in Elsa
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 15 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Atlas with Rear A/C unit.
Labor Operation 3) : Refrigerant drain and fill
87031700 = See Elsa for the latest time units
Labor Operation 3): Air Conditioner Check
87010150 = See Elsa for the latest time units
Labor Operation 3): Air Conditioner Clean
87013099 = 300 TU
Labor Operation 3): Replace Receiver-Drier
87555550 = See Elsa for the latest time units
Labor Operation 3): Front grille remove and reinstall.
66051999 = 20 TU
Labor Operation 3): Replace Expansion Valve
87701950 = See Elsa for the latest time units
Labor Operation 3): Replace Rear Expansion Valve
88701900 = See Elsa for the latest time units
All Vehicles
Outside Material: A/C Flush Machine MAHLE filter, Item No. 0268056100
8.50 total per A/C System Flush which accompanies a repair (this amount equals 1/5 of the cost of the A/C flush machine filter)
Diagnostic Time 4)
GFF Time expenditure
01500000 = 00 TU max.
NO
Road Test
01210002 = 00 TU
01210004 = 00 TU
NO
Technical Diagnosis
01320000 = 00 TU max.
NO
Claim Comment: Input “As per Technical Bulletin 2049039” in comment section of Warranty Claim.
1) Vehicle may be outside any Warranty in which case this Technical Bulletin is informational only.
2) Code per warranty vendor code policy.
3) Labor Time Units (TUs) are subject to change with ELSA updates.
4) Documentation required per Warranty Policies and Procedures Manual.
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 16 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Required Parts and Tools
Part Description
Part No:
Quantity
Receiver-Drier
Vehicle Specific
1
Expansion Valve
Vehicle Specific
1
Rear Expansion Valve (Atlas only)
3QF820712A
1
Clamping Washer
N90335004 with WHT003386
1
Tool Description
Tool No:
Air Conditioning Service System
MAHLE R1234yf A/C Service Unit
VAS581005
R1234yf Flush Kit
RTI360831040
Air Conditioning System Flushing Device Filter
R1234yf Air Conditioning Unit – Filter – External Flush
Item: 0268056100
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 17 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Adapter set for refrigerant circuits
VAS 6338/1
Refrigerant circuit adapter for MAHLE A/C Service Unit and R1234yf Flush Kit
VAS6338/48
Refrigerant circuit adapter for expansion valve bypass
VAS6338/38
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 18 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Refrigerant circuit adapter for expansion valve bypass
VAS 6338/18
Adapter bypass for A/C compressor line
VAS 6338/3
Adapter bypass for A/C compressor line
VAS 6338/12
Additional adapter bypass for Atlas rear A/C unit high side rear line.
VAS 6338/60
Technical Service Bulletin Transaction No: 2049039/4
87-18-08 – Air Conditioning, Cleaning of the R1234yf Refrigerant
Circuit (U.S. Only)
Release date: 6/14/2019
Page 19 of 19
© 2019 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and
other intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Additional adapter for Atlas rear A/C line block off.
VAS6338/63
Additional adapter bypass for Atlas rear A/C unit low side rear line.
VAS 6338/3
Additional adapter for Atlas rear A.C line block off.
VAS6338/5
Additional Information
All part and service references provided in this Technical Bulletin are subject to change and/or removal. Always check with your Parts Dept. and Repair Manuals for the latest information.

SEOCONTENT-END