SOURCE: heater control 98 chevy s10 blazer
These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.
SOURCE: vacuum leak
Hey there. I've got a 96' blazer and this happened to me as well. Turned out that I was getting the 4 wheel drive checked out because it wasn't engaging and they found that a vacuum hose was loose. The mechanic said that when it is a vacuum hose, the blower won't engage correctly to the desired setting... usually just blows out the defrost. Hope that helps.
Ben
SOURCE: 1996 chevy truck A/C, Heater and defrost not
Could be the blower motor, I have had and am continuing to have the same problem. Replacing the motor did help though.
SOURCE: front windshield defroster on my 96 chevy truck doesnt work
defrost dorr is not opening check to see if cable clamp has broken or if works off vaccum check for broken vacum line. berrydalewolfe
566 views
Usually answered in minutes!
same problem on 3 of my plow trucks. if you look up by the right side of your gas peddle you will see where the springs from the motor hooks to a lever that runs the flapper.the other end of the flapper fell out of its hole. you can put it back in but what holds it there i have no idea. but manually you can turn it on what setting you want. im going to do some more research on this to find out if that is an easy fix because its no fun taking the dash out
×