I turn the air conditioning on it will only blow through the defroster vents

Tiny
SKABOTCH
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 54,000 MILES
I recently replaced my battery and ever since then when I turn the air conditioning on it will only blow through the defroster vents. I seems to cycle through from the floor to the normal air vents and then goes to the defroster vents.

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Thursday, September 11th, 2008 AT 5:39 PM

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Tiny
MERLIN2021
  • EXPERT
1. Clear all DTCs 2. Place the ignition switch to the OFF position. 3. Disconnect the scan tool. 4. Install the motor assembly. 5. Re-connect all previously disconnected components. 6. Remove the HVAC/ECAS fuse for a minimum of 10 seconds. 7. Re-install the HVAC/ECAS fuse. 8. Start the vehicle. 9. Wait 40 seconds for the HVAC control module to re-calibrate. 10. Verify that no DTCs have set as current DTCs. This is how to reset the A/C without the gm scantool. Try this out.
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Thursday, May 13th, 2021 AT 6:55 PM

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