Isuzu 2000 Trooper Workshop Manual page 70

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Connect The Manifold Gauge
Low-pressure hose (LOW) — Suction side
High pressure hose (HI) — Discharge side
Legend
(1) Low Side
(2) High Side
Condition
Discharge (High Gauge) Pressure
Abnormally High
Abnormally High
Discharge (High Gauge) Pressure
Abnormally High.
Insufficient cooling.
Discharge (High Gauge) Pressure
Abnormally High.
High pressure gauge drop. (After
stopping A/C, the pressure drops
approx. 196 kPa (28 psi) quickly)
Discharge (High Gauge) Pressure
Abnormally Low.
Insufficient cooling
Discharge (High Gauge) Pressure
Abnormally Low.
Low
pressure
gauge
vacuum.
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–41
Possible cause
Condenser clogged or dirty.
Cooling
fan
properly.
Excessive refrigerant in system.
Air in system.
Insufficient refrigerant in system.
Clogged or defective expansion
valve.
indicates
Clean the condenser fins
does
not
operate
Check the cooling fan operation.
Discharge and recover refrigerant.
Recharge to specified amount.
Evacuate and charge refrigerant
system.
Check for leaks. Discharge and
recover the refrigerant. Recharge to
the specified amount.
Replace the expansion valve.
901RS137
Correction

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