( TL19E00G10100000000FEAT00 )

A/C System Test

Pressure Test

Test results | Related symptoms | Probable cause | Remedy
--- | --- | --- | ---
Driver's and passenger's side vent temperatures vary by more than 11 °C (20 °F) | Poor A/C performance. Discharge (high) and suction (low) pressures are low. | Low refrigerant charge | Recover, evacuate, and recharge with specified amount.
Air mix door inoperable | Repair or replace.
Discharge (high) pressure abnormally high | After stopping A/C compressor, pressure drops about 196 kPa (2.0 kgf/cm 2 , 28 psi) quickly, and then falls gradually. | Air in system | Recover, evacuate, and recharge with specified amount.

Reduced or no airflow through A/C condenser.

- Clogged condenser or radiator fins
- A/C condenser or radiator fan not working properly

- Clean.
- Check voltage and fan rpm.
- Check fan direction.

Line to A/C condenser is excessively hot. | Restricted flow of refrigerant in system | Restricted lines.

Discharge pressure abnormally low

High and low-pressures are balanced soon after stopping A/C compressor. Low side is higher than normal.

- Faulty A/C compressor discharge valve
- Faulty A/C compressor seal

Replace the A/C compressor.

Outlet of expansion valve is not frosted, low-pressure gauge indicates vacuum.

- Faulty expansion valve
- Moisture in system

- Replace.
- Recover, evacuate, and recharge with specified amount.

Suction (low) pressure abnormally low

Expansion valve is not frosted, and low-pressure line is not cold. Low-pressure gauge indicates vacuum.

- Frozen expansion valve (Moisture in system)
- Faulty expansion valve

- Recover, evacuate, and recharge with specified amount.
- Replace the expansion valve.

Discharge temperature is low, and the airflow from vents is restricted. | Frozen evaporator | Run the fan with A/C compressor off, then check evaporator temperature sensor .
Expansion valve is frosted. | Clogged expansion valve | Clean or replace.
Receiver/dryer outlet is cool, and inlet is warm (should be warm during operation). | Clogged receiver/dryer | Replace.
Suction pressure abnormally high | Low-pressure hose and service port are cooler than the temperature around evaporator. | Expansion valve open too long | Repair or replace.
Suction pressure is lowered when A/C condenser is cooled by water. | Excessive refrigerant in system | Recover, evacuate, and recharge with specified amount.

High and low-pressures are equalized as soon as the A/C compressor is stopped, and both gauges fluctuate while running.

- Faulty gasket
- Faulty high-pressure valve
- Foreign particle stuck in high-pressure valve

Replace the A/C compressor.

Suction and discharge pressures abnormally high

Reduced airflow through A/C condenser.

- Clogged A/C condenser or radiator fins
- A/C condenser or radiator fan not working properly

- Clean.
- Check voltage and fan rpm.
- Check fan direction.

Suction and discharge pressures abnormally low | Low-pressure hose and metal fittings are cooler than evaporator. | Clogged or kinked low-pressure hose parts | Repair or replace.
Temperature around expansion valve is too low compared with that around receiver/dryer. | Clogged high-pressure line | Repair or replace.
Refrigerant leaks | A/C compressor clutch is dirty. | A/C compressor shaft seal leaking | Replace the A/C compressor.
A/C compressor bolt(s) are dirty. | Leaking around bolt(s) | Tighten bolt(s) or replace A/C compressor.
A/C compressor gasket is wet with oil. | Gasket leaking | Replace the A/C compressor.
A/C fitting is dirty. | Leaking O-ring | Clean the A/C fitting and replace the O-ring.