My AC/heater will only blow on the highest setting. Level 5. How can I repair it

Tiny
SMITTYSFATHER
  • MEMBER
  • 2004 CHEVROLET AVALANCHE
  • 160,000 MILES
This problem began approx. A week ago.
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Tuesday, October 18th, 2011 AT 12:53 PM

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Tiny
JDL
  • EXPERT
With automatic hvac check for applicable trouble codes. If the hvac module detects a problem, it will default to defrost. Some of the national brand autostores used to check some codes for free. I haven't looked at your wiring, yet.
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Tuesday, October 18th, 2011 AT 2:09 PM
Tiny
JDL
  • EXPERT
I did find a TSB possibility. The hvac control harness may rub against a sharp edge of instrument cluster brace, causing the actuator control to short.
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Tuesday, October 18th, 2011 AT 2:16 PM

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