Rick's Free Auto Repair Advice

No Heat or AC — GM Trucks

No Heat or AC — GM Trucks

Owners of some GM Truck and some SUV owners may experience a problem where they have no heat or AC or cannot control the heating, ventilation and A/C system. They may also find that the system always defaults to the DEFROST mode. The following trouble codes may be stored in memory: B0229-Recirculation Actuator, B0414- Left Air Temperature Actuator, B0424 Right Air Temperature Actuator, or B3770 Mode Actuator Cause

GM reports that the problem may be found in the HVAC actuator harness contacting a sharp edge of the instrument panel (like they couldn’t have seen that coming during production). If that happens, it creates a rub through and grounding of the actuator control and feedback circuits. This problem may affect 2003-05 Cadillac Escalade, Escalade ESV, Escalade EXT, Chevrolet Avalanche, Silverado, Suburban, Tahoe, and GMC Sierra, Yukon, and Yukon XL.

To fix the problem, find the HVAC harness rubbing point behind the instrument panel. This is on the left side of the dash, behind the instrument panel compartment door. Open the door and locate the harness to inspect it. Repair any damaged wires. Install protective sleeving around the harness. Install friction tape to cover the sharp edges of the instrument panel brace.

Clear the trouble codes.


© 2012 Rick Muscoplat

Posted on by Rick Muscoplat

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