WD Catalog 2018

917 / 1003

8-17 - -
Repair Procedure:
After you locate the defective component con-
taining the restriction, recover all of the refrig-
erant. Replace the defective component and the
receiver-drier. Evacuate and recharge the sys-
tem with refrigerant, then check AC operation
and performance.
0
100
200 300
400
500
HIGH
TEMPERATURE
LOW
TEMPERATURE
150
120
90
60
30
0
10
20
30
Compressor Malfunction
LOW SIDE HIGH HIGH SIDE LOW
Tip: The compressor may be noisy when it operates.
Cause: Defective reed valves or other compressor com-
ponents. If the compressor is not noisy, there
may be a worn or loose compressor clutch drive
belt.
Repair Procedure:
If you find the belt worn or loose, replace or
tighten it and recheck system performance and
gauge readings. To inspect and service the com-
pressor, you must isolate (front seat the stem
type compressor service valves) and recover re-
frigerant, or fully recover R-12 from systems
containing Schrader valves. Remove the com-
pressor cylinder head and check the appearance
of the reed valve plate assembly. If defective,
replace the valve plate and install with new gas-
kets, or replace the compressor assembly.
Manifold Gauge Set Readings
Figure 8-12
Gauge reading, compressor
malfunction.