GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1998 🢒 Silhouette Ext. 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Cooling Insufficient - Air Conditioning (A/C) Inoperative

Perform the following tests first, in order to eliminate any possible misdiagnosis:

Insufficient cooling may be caused by one of several components or system, such as the following components and systems:

    • The A/C compressor
    • The refrigeration system
    • The air delivery system
    • The PCM

Step

Action

Value(s)

Yes

No

DEFINITION:

There is insufficient cooling in the passenger compartment.

1

Perform the On-Board Diagnostic Stystem Check. Refer to Powertrain On Board Diagnostic (OBD) System Check .

Are there any stored Diagnostic Trouble Codes (DTCs)?

--

Go to Step 2

Go to Step 3

2

Repair the system that is related to the DTC.

Refer to Engine Controls.

Is the repair complete?

--

System OK

--

3
  1. Open the doors and the hood in order to neutralize the vehicle internal temperature with the shop temperature.
  2. Install the J 39500-B ACR4 Station onto the vehicle.
  3. Test the low-side system static pressure.

Is the low-side system static pressure below 310 kPa (45 psi)?

--

Go to Step 5

Go to Step 4

4

If the low side system static pressure is above 310 kPa (45 psi), perform the A/C System Performance Test. Refer to System Performance Test .

Is the repair complete?

--

System OK

--

5
  1. Perform a leak test on the system. Refer to Leak Testing .
  2. Perform any necessary repairs.
  3. Evacuate and charge the system.
  4. Perform the A/C System Performance Test. Refer to System Performance Test .

Is the repair complete?

--

System OK

--