SECTION 50 - CAB HEATING AND AIR CONDITIONING 35
PERFORMANCE TEST EXAMPLE 4
Performance Test Example 4
1. High side low
2. High side hand valve closed
3. High side hose connected to high side service
connector
4. Not used
5. Low side hose connected to low side service
connector
6. Low side hand valve closed
7. Low side high
PROBLEM
Insufficient cooling.
CAUSE
Compressor malfunction.
CONDITIONS*
Low side pressure too high. Gauge should read 1-2
bar.
High side pressure too low. Gauge should read
13.3-14.8 bar.
Evaporator air not cold.
CORRECTIVE PROCEDURES
1. Replace the compressor.
DIAGNOSIS
Internal leak in compressor caused by worn or
scored pistons, rings, or cylinders.
NOTE: * test procedure based upon ambient tem-
perature of 35 °C.
For proper high side gauge reading for other ambi-
ent temperatures, refer to the pressure temperature
chart.
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F28700
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