Conversion of A/C system from R12 to R134a Retrofit:
Page 9
A23
Refilling system with refrigerant
On completion of vacuum pumping, fill system with max. 200 grams (0.44
lbs) refrigerant R134a
Leakage testing after filling. Use leakage detector.
Repair any leaks.
When no leakage is detected fill with remainder of refrigerant R134a
to the amount
stated below. (the link
refers to a table of refrigerant capacities)
740
-1990
2.4 lb
760
-1987
2.4 lb
780
-1991
2.4 lb
740/940
91-92
2.1 lb
940SE/760/960
88-92
2.0 lb
I applied the small amount of freon from a filler hose that I purchased
at a local parts store where I purchased the freon cans. One end screws
onto the can and the other snaps onto the filler cap installed previously.
Hold the can upright so gas, not liquid, is sucked into the system. I
then opened the valve and let the vacuum suck the initial freon into the
system and then the can provided enough pressure to trigger the pressostat
switch to turn on the compressor. I started the car and turned the A/C
system on to max cool and raised the idle and made the compressor suck
the freon out of the can. I have a 88 740 which requires 2.4 lb or 38
oz. The cans are 12 oz. I put in 36 oz and saved the other can for a spare.
Once freon is added check for proper cooling, and your done. The remainder
is if you could pump the correct amount in the system.
Verify Functions
A24
Start:
Engine
A/C System
Check that:
Compressor starts and operates normally without unusual noise
In car air is cooled.
Stop engine
Check for leakage with leakage detector
Repair and leaks indicated.
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