A/C - Intermittent Operation

File in Section: 01 - HVAC

Bulletin No: 00-01-38-004

Date: March, 2000

TECHNICAL

Subject:
Intermittent A/C Operation
(Clean Terminals, Seal A/C Low Pressure Sensor)

Models:
1996-99 Chevrolet and GMC G-Van (Plant Code 1)

Condition

Some owners may comment on intermittent air conditioning (A/C) system operation.

Cause

Like most intermittent conditions, the cause may be a high resistance connection between the wiring harness and a particular electrical component. In this instance, the high resistance may be caused by moisture intrusion into the wiring harness connector at the Low Pressure switch, which may cause corrosion of the terminals.

Correction

Tools Required

^ J 35616-A GM Terminal Test Kit

^ J 38125-B GM Terminal Repair Kit

1. Clean the low pressure switch terminal and the wiring harness connectors with D.P.L. Moisture Displacing Lubricant, GM P/N 1052864 (in Canada use P/N 10952982) or equivalent.

2. Using the mating terminals found in J 38125-B GM Terminal Repair Kit, or J 35616-A GM Terminal Test Kit, test the tension of the wiring harness terminals. Replace the terminals which do not have the proper tension or show evidence of excessive pitting or corrosion.

3. Lightly coat the mating surfaces of the switch terminals and the wiring harness terminals with a small amount of CLEAN Dielectric Silicone Grease, GM P/N 12345579 (in Canada use P/N 1974984) or equivalent.

4. Connect the wiring harness connector to the low pressure switch.

5. Test the A/C system for proper operation.

Parts Information

Parts are currently available from GMSPO.

Warranty Information





For vehicles repaired under warranty, use the table.