A/C Shuts Off for 3-5 Minutes in Hot Weather with Vehicle Speed At/Above 113 km/h (70 mph) (Reprogram Dash Integration Module (DIM))

Some customers may comment that while driving at speeds of 113 km/h (70 mph) or greater in outside ambient temperatures of 35°C (95°F) or greater, the air conditioning (A/C) system shuts off for 3-5 minutes. The HVAC control is set at full cold (16°C (60°F)) and the blower speed is set at medium (3 bars).

This condition may be due to the refrigerant gas temperatures being so high it causes the thermal limit switch to shut off the a/c compressor.

The a/c compressor is controlled by the Dash Integration Module (DIM). A DIM calibration is now available that will reduce a/c compressor cycle time. Reprogram the DIM.

Important: Prior to performing the reprogramming procedure, review the following:

Important: Ensure the Tech 2® and terminal have been updated with software version 22.004 (released May 6, 2002) or greater before attempting this procedure.

1. Using the Tech 2® diagnostic scan tool, connect the diagnostic link connector (DLC) to the vehicle.
2. Press POWER KEY.
3. Select DIAGNOSTICS.
4. BUILD the vehicle. Enter the appropriate vehicle identification information (model year, vehicle type).
5. Select BODY.
6. BUILD the vehicle. Enter the appropriate vehicle identification information (carline, carline series).
7. Select DASH INTEGRATION MODULE.
8. Select SPECIAL FUNCTIONS.
9. Select SET OPTIONS.
10. Select A/C COMPRESSOR CAL.
11. Select A/C COMP. TURN ON CAL.
12. Exit the Tech 2® and disconnect the DLC from the vehicle.

The calibrations are electronic calibrations and are NOT available from GMSPO. Calibrations are available from Techline beginning with the TIS 2000 data release of version 5.0 or later.

For vehicles repaired under warranty, use: