Air Conditioning (A/C) Diagnostics - Pressure Zone C

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
DEFINITION: The low and the high side pressures are both higher than normal. Restricted Condenser Air Flow Cooling Fan Malfunction Expansion Device Malfunction
1	Were you sent here from the A/C System Performance Test?	Go to Step 2	Go to Air Conditioning (A/C) System Performance Test
2	Start the engine. Make sure that the A/C is ON. Inspect for proper cooling fan operation. Refer to Cooling System Description and Operation . Are the cooling fans ON and operating properly?	Go to Step 3	Go to Step 5
3	Visually inspect for the following conditions: Damaged condenser cooling fins Missing or misaligned air baffles Restricted front end air flow Do any of these conditions exist?	Go to Step 4	Go to Step 6
4	Repair the air flow restriction. Is the repair complete?	Go to Step 7	-
5	Repair the fault to the cooling fan operation. Refer to Cooling Fan Inoperative . Is the repair complete?	Go to Step 7	-
6	Air is in the refrigerant system, or the system is overcharged. Refer to J 43600 view screen on ACR 2000 Air Conditioning Service Center for foreign gas content in the refrigerant. See Special Tools . Recover and recharge the A/C system. Refer to Refrigerant Recovery and Recharging . Is the repair complete?	Go to Step 7	-
7	Record the low and high side pressures and the instrument panel (I/P) outlet air temperature after you have performed the repairs. Compare the pressures and the panel 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 listed in the A/C Performance table?	Go to Step 8	Go to Air Conditioning (A/C) System Performance Test
8	Operate the system in order to verify the repair. Did you find and correct the condition?	System OK	Go to Symptoms - HVAC Systems - Automatic