5. Carefully feel the hoses and components on the
high side. All should be warm-hot to the touch.
Check the inlet and outlet of receiver-drier for even
temperatures, if outlet is cooler than inlet, a re-
striction is indicated.
Use extreme caution when placing hands on high
side components and hoses. Under certain condi-
tions these items can be extremely hot.
6. Feel the hoses and components on the low side.
They should be cool to the touch. Check connec-
tions near the expansion valve, inlet side should
be warm and cold-cool on the outlet side.
7. If these conditions are met, the system is consid-
ered normal. Shut down engine. Remove gauges
and install the caps on the service valves.
DIAGNOSIS OF GAUGE READINGS & SYSTEM
PERFORMANCE
The following Troubleshooting Chart lists typical mal-
functions encountered in air conditioning systems. In-
dications and or problems may differ from one system
to the next. Read all applicable situations, service pro-
cedures, and explanations to gain a full understanding
of the system malfunction. Refer to information listed
under “Suggested Corrective Action” for service pro-
cedures.
M9-20 Air Conditioning System M09010 6/97
for HFC 134a Refrigerant
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