Driver's and passenger's side vent temperatures vary by more than 11 °C
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Poor A/C performance. Discharge (high) and suction (low) pressures are low.
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Low refrigerant charge
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Air mix door inoperable
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Repair or replace.
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Discharge (high) pressure abnormally high
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After stopping A/C compressor, pressure drops about 196 kPa (2.0 kgf/cm
2
, 28 psi) quickly, and then falls gradually.
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Air in system
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Reduced or no airflow through A/C condenser.
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Line to A/C condenser is excessively hot.
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Restricted flow of refrigerant in system
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Restricted lines.
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Discharge pressure abnormally low
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High and low-pressures are balanced soon after stopping A/C compressor. Low side is higher than normal.
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Replace the A/C compressor.
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Outlet of expansion valve is not frosted, low-pressure gauge indicates vacuum.
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Faulty expansion valve
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Moisture in system
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Suction (low) pressure abnormally low
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Expansion valve is not frosted, and low-pressure line is not cold. Low-pressure gauge indicates vacuum.
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Recover, evacuate, and recharge with specified amount.
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Replace the expansion valve.
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Discharge temperature is low, and the airflow from vents is restricted.
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Frozen evaporator
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Run the fan with A/C compressor off, then check evaporator temperature sensor.
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Expansion valve is frosted.
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Clogged expansion valve
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Clean or replace.
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Receiver/dryer outlet is cool, and inlet is warm (should be warm during operation).
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Clogged receiver/dryer
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Replace.
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Suction pressure abnormally high
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Low-pressure hose and service port are cooler than the temperature around evaporator.
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Expansion valve open too long
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Repair or replace.
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Suction pressure is lowered when A/C condenser is cooled by water.
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Excessive refrigerant in system
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Recover, evacuate, and recharge with specified amount.
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High and low-pressures are equalized as soon as the A/C compressor is stopped, and both gauges fluctuate while running.
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Replace the A/C compressor.
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Suction and discharge pressures abnormally high
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Reduced airflow through A/C condenser.
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Suction and discharge pressures abnormally low
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Low-pressure hose and metal fittings are cooler than evaporator.
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Clogged or kinked low-pressure hose parts
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Repair or replace.
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Temperature around expansion valve is too low compared with that around receiver/dryer.
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Clogged high-pressure line
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Repair or replace.
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Refrigerant leaks
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A/C compressor clutch is dirty.
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A/C compressor shaft seal leaking
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Replace the A/C compressor.
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A/C compressor bolt(s) are dirty.
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Leaking around bolt(s)
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Tighten bolt(s) or replace A/C compressor.
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A/C compressor gasket is wet with oil.
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Gasket leaking
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Replace the A/C compressor.
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A/C fitting is dirty.
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Leaking O-ring
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Clean the A/C fitting and replace the O-ring.
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