Manifold Gauge Set ReadIngs
Inspect the condenser for dirt, bugs or other debris
and clean if necessary. Be sure the condenser is
securely mounted and there is adequate clearance
(about 1-1/2 inches) between it and the radiator.
Check the radiator pressure cap and cooling sys-
tem, including the fan, fan clutch, drive belts and
radiator shutter assembly. Replace any defective
parts and then recheck AC system operation,
gauge readings and performance.
If the problem continues, the system may be over-
charged (have too much refrigerant inside). Re-
cover the system slowly until low and high pres-
sure gauges read below normal, and bubbles ap-
pear in the sight glass. Then add refrigerant
(charge the system) until pressures are normal
and the bubbles disappear. Add another quarter to
half pound of refrigerant and recheck AC system
operation, gauge readings and performance.
If the high gauge readings do not change, you
should recover all of the refrigerant and flush (it
may be partially plugged) or replace the con-
denser. Also replace the receiver-drier or accumu-
lator. Then connect the components and evacuate
the system. Recharge the air conditioner with re-
frigerant and check system operation and perfor-
Thermostatic Switch Malfunction
Gauge reading, thermostatic
The low side gauge needle may fluctuate in a very
narrow range compared to a normal range. The
frequently than it should.