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Air conditioning goes to defrost when truck first starts.....

767 views 3 replies 3 participants last post by  ZMANN 
#1 ·
It's starting to get worse. When I first start the truck, and turn the a/c on max, it will default to defrost. If I turn it to low fan though, it will come out the face level vents. As I drive the truck, i can turn it to max fan, but it never blows as hard as before. Are there vacuum lines I can check for the blend/door motor, or is this more likely the motor itself??
 
#3 ·
yeah its on there
 
#4 ·
that little control valve only gets vacuum when max AC is selected any other time that vacuum line has no vacuum

it sounds like your loosing vacuum when the truck sits due to a leak

and the vents are having an issue changing from defrost to the desired
I would start by checking the Vacuum strength
 
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