WD Catalog 2018

919 / 1003

8-19 - -
Cause: The condenser is not functioning correctly or
there may be an overcharge of refrigerant inside
the system. Another possibility is lack of (ram)
air flow through the condenser fins during test-
ing. Engine cooling system component malfunc-
tion can cause high pressure by blocking air flow
(radiator shutter) or not providing air flow (fan
clutch) in sufficient quantity.
Repair Procedure:
Inspect the condenser for dirt, bugs or other de-
bris and clean if necessary. Be sure the con-
denser is securely mounted and there is ad-
equate clearance (about 1-1/2 inches) between it
and the radiator. Check the radiator pressure
cap and cooling system, including the fan, fan
clutch, drive belts and radiator shutter assem-
bly. Replace any defective parts and then re-
check AC system operation, gauge readings and
performance.
If the problem continues, the system may be
over- charged (have too much refrigerant inside).
Recover the system slowly until low and high
pressure gauges read below normal, and bubbles
appear 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 sys-
tem 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 accu-
mulator. Then connect the components and
evacuate the system. Recharge the air condi-
tioner with refrigerant and check system opera-
tion and performance.
Manifold Gauge Set Readings