Cabriolet L4-1781cc 1.8L SOHC (JH) (1989)
Technical Service Bulletin # 879503
Date: 950531
A/C System - Retrofitting R-12 to R-134a
GROUP: 87
NUMBER: 9-3
DATE: May 31, 1995
SUBJECT:
A/C System, Retrofitting R-12 to R-134a
MODEL(s):
All (except Fox) m.y. 1985 to m.y. 1992
Please read all sections of this Bulletin thoroughly before proceeding with retrofit!
At customers request and expense, A/C systems on the following models may be retrofitted to use refrigerant R-134a.
Golf Cabriolet
1985 - 1992
Golf/Jetta
1985 - 1992
Scirocco
1985 - 1989
Corrado
1989 - 1992
Passat
1990 - 1992
Quantum
1985 - 1988
Vanagon
1985 - 1991
EuroVan (Canada only) 1992
Note
Retrofitting to refrigerant R-134a is not reimbursable under warranty.
Caution!
Part numbers are for reference only Always check with your Parts Dept. for the latest parts information.
Caution!
Always use separate refrigerant recovery, recycling and recharging service equipment for R-12 and R-134a systems. if the same piece of equipment
is used for both R-12 and R-134a systems, residual traces of refrigerant will contaminate and damage the equipment.
Service equipment includes recovery, recycling, recharging station, vacuum pump, manifold gauges, etc.
Caution!
Do Not blow compressed air and nitrogen through the compressor or expansion valve. Refrigerant circuits retrofitted to use R-134a must not be
rinsed with agent R11.
Replacement compressors are filled with nitrogen. if gas does not escape when removing protective caps on suction and discharge ports, assume leakage
and do not install compressor.
When replacing damaged compressors, ensure existing mineral based refrigerant oil is drained and replaced with PAG oil.
Always replace receiver drier If refrigerant circuit is left open.
Due to residual amounts of mineral based refrigerant oil In systems retrofitted to use refrigerant R-134a, the newly Installed PAG refrigerant oil will
discolor Immediately after use. This is normal and does not Indicate a refrigerant related fault.
R-134A Retrofit, System Preparation
R-134A RETROFIT, SYSTEM PREPARATION
^
Review all Cautions, Warnings and A/C refrigerant system safety measures stated in appropriate model repair information, --> Repair Manual,
Air Conditioning, Repair Group 87.
^
Always use Underwriter's Laboratory (UL) approved refrigerant service equipment such as Kent Moore ACR3, ACR4 or equivalent.
^
Before proceeding with retrofit, perform a visual inspection and functional test of complete A/C system; including instrument panel outlet
temperature, air distribution, refrigerant system components, system pressure and leak test. --> Repair Manual, Air Conditioning, Repair Group
87. Repair/replace parts as necessary.