Air Conditioning (A/C) Diagnostics - Pressure Zone C. Oldsmobile Silhouette Ext. 2001

For 1990-2009 cars only

Makes 🢒 Oldsmobile 🢒 2001 🢒 Silhouette Ext. 🢒 HVAC 🢒 Heating, Ventilation and Air Conditioning 🢒 Air Conditioning (A/C) Diagnostics - Pressure Zone C

Step

Action

Yes

Were you sent here from the A/C System Performance Test?

With the engine idling, turn ON the A/C.
Inspect for proper cooling fan operation. Refer to Cooling System Description and Operation in Engine Cooling.

Are the cooling fans ON and operating properly?

Visually inspect for the following:

•	Restricted air flow.

•	Damaged condenser cooling fins.

•	Inspect for missing or misaligned air baffles.

Do the following conditions exist?

Repair the air flow restriction.

Is the repair complete?

Repair the cooling fan operation fault. Refer to Cooling Fan Inoperative in Engine Cooling.

Is the repair complete?

Caution: Refer to Moving Parts and Hot Surfaces Caution in the Preface section.

Feel the liquid line on both sides of the expansion device.

Is the temperature the same before and after the expansion device?

Replace the damaged/faulty thermal expansion valve. Refer to Thermal Expansion Valve Replacement .

Is the repair complete?

Air is in the refrigerant system, or the system is overcharged. Refer to the view screen on the J 43600 for foreign gas content in the refrigerant.

Recover and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Is the repair complete?

Record the low and high side pressures and the IP outlet air temperature after repairs are performed.
Compare the pressures and outlet temperature to those listed in the A/C Performance Chart. Refer to Air Conditioning (A/C) System Performance Test .

Are the readings within the specified ranges?

Operate the system in order to verify the repair.

Did you correct the condition?

System OK