1999 Chevrolet Silverado Repair Question
What is the sound like electrical pulsation behind dashboard in 1999 Silverado
Asked by lhutchsnAnswer
blend door motor for the heat/ac system.
common failure.
Roy
lhutchsn posted this in an email.
The blend door motor. But if I turn off the A/C and the fan, shouldn't the sound stop then?
Thanks.
this motor is activated by changing from cold to hot and the other is the motor that directs air flow. does the air flow change when the noise occurs?? if not, then it is the one for cold to hot.
get a shop to verify it and give you a bid.
sorry it took so long, I was working a 13 hour day yesterday.
Roy
I appreciate your help and am sorry you had such a long day. If I want to change the air flow I can and I can also go from hot to cold using the controls. Nothing changes when the noise occurs. It just makes that noise. Also, the noise continues even if the fan and the a/c are turned off. None of those motors should want to work then should they? Thanks again for your help.
I actually love my job and get caught up in it very easily.
I was just thinking of something. do you have a power antennae outside the truck?? the relay is inside and can do this as well.
Roy
No I don't have a power antenna. Wish it were that simple.
well, i am out of ideas. sorry. i still think that it is one of the mode door motors. you need to have a shop listen to it and figure out the noise and give you a bid.
Roy
I'll do it. Thanks so much for your help.