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HVAC Compressor Controls System Check

WARNING: This page is about a different car, the 1999 GMC Sierra and 1999 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
HVAC Compressor Controls System Check

Step Action Normal Result(s) Abnormal Result(s)*
1
  1. Start the engine.
  2. Move the blower speed selector to any position except the OFF position.
  3. Press the air conditioning (A/C) switch to the ON position.
  • The blower motor runs.
  • The A/C compressor clutch engages.
HVAC Compressor Clutch Does Not Engage 
* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.