Checking the A/C System 1975-1990
CHECKING THE A/C SYSTEM, 1975-1990A1
START ENGINE
- Turn on A/C system, select highest bower speed, Max. Cooling (not "REC" recirculation). Leave front doors or side windows open.
- Check if compressor starts. If it does not then the refrigerant might have leaked out Refer to A3 for more information.
A2
If the compressor starts there is refrigerant in the system. Proceed as follows:
- turn off engine (after running for 40 minutes)
- leak detection. Use leakage detector.
- connect R12 recycling/filling unit. A general collection unit may also be used.
- evacuate the system on R12 unit until a vacuum has been created (approx. 10 minutes)
- disconnect the recycling/filling unit
- replace any components that are leaking but not if the equivalent parts are in the retrofit kit.
A3
If the compressor does not start when checking A/C operation:
- check if there are any visible leaks or other faults on the system
- connect R12 recycling/filling unit. A general collection unit may also be used.
- evacuate the system on R12 unit until a vacuum has been created (approx. 10 minutes)
- disconnect the recycling/filling unit
- replace any components that are leaking but not if the equivalent parts are in the retrofit kit.
NOTE!
If the compressor still does not start, perform fault-tracing as per service manual Section 8 (82-88) TP31120/1.