Quote:
Originally Posted by big white bufflo
it could be the mixing motor behind the glove box they go bad and cause the same issue it may blowe cold air out the defrost and warm out the bottom its some time intermitten if you turn the key off some time it reset it self and work fine then the trouble comes back only way to see if it woking is to watch it look for your climmate control module it on top of that it a little motor that run the vents
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The actuator on a dual system controls the temp blend door to the driver. It's on top of the box. The defroster is a vacuum motor on the driver's side of the stack.
If a dual system the passenger blend door is controlled from the programmer box with a motor inside and a link rod.
His problem is vacuum and the easiest is a 10 foot piece of small tubing from the vacuum port on the motor or the reservoir on the firewall and apply to the vacuum motor inside to see if it works -- or buy a hand vacuum pump for testing.