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

2003 CHEVROLET SILVERADO
54,000 MILES • V8 • 2WD • AUTOMATIC
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SKABOTCH
  • MEMBER
  • 1 POST
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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Sep 11, 2008 at 10:39 AM
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MERLIN2021
  • ✓Experienced Mechanic
  • 17,250 POSTS
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.
May 13, 2021 at 11:55 AM
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