2003 Chevrolet Silverado



September, 30, 2007 AT 7:16 PM

I have a 2003 chevy silverado 5.3liter it has 80,000 miles. My question is when I turn on the air it always blows out the defrost. Will not stay where the control knob is. How do I fix this?

2 Answers



September, 30, 2007 AT 7:47 PM

Is it electronic if yes
need a motor
If not check you vacuum hoses

good luck



September, 30, 2007 AT 10:02 PM

I think you are having an issue with the mode door actuator. If you have a good scanner, you can compare the mode actuator desired counts to the actual counts. This will tell you if you have an actuator problem.

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