2003 Chevrolet Silverado 1500 - Only defrost

Regardless where I put my switch for air , it stays on defrost

The actuator has probably gone bad. There could also be a vacuum line that came loose.

The mode door actuator has failed.

The default for when the mode door actuator fails is defrost.

That’s so if it fails in the winter, the windshield can be kept clear.

https://www.rockauto.com/en/moreinfo.php?pk=9662020&cc=1412075&jsn=471

Tester

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