Defrost not working?
Thread Starter
|
Senior User
Joined: Aug 2003
Posts: 137
Likes: 0
Defrost not working?
hey guys, i know it's early in the year to be concerned about my defroster, but i just bought this truck and one morning i went to switch it from a/c to defrost and it would blow hot air like i wanted, but it didn't switch from blowing out the vents in the dash to the vents in the top. this is on a 94 f-350 4x4 351. is this a common problem or something easily fixed? any help would be appreciated
CO River Rat
Joined: Feb 2004
Posts: 3,209
Likes: 0
From: Lake Havasu City AZ
Super -
Normally, defrost is the default position for HVAC (should work when nothing else does), so I'd suspect a sticking/stuck door that can't make it to the defrost position. Not sure if the door is cable- or vaccuum-operated on your '94.
Steve
Normally, defrost is the default position for HVAC (should work when nothing else does), so I'd suspect a sticking/stuck door that can't make it to the defrost position. Not sure if the door is cable- or vaccuum-operated on your '94.
Steve
Tuned
Joined: Mar 2004
Posts: 400
Likes: 2
From: South Texas
I have a '93 Bronco and it is vacuum operated so I am pretty sure that '94 is set up the same way. What Staina said sounds like the best place to start. When my truck had a vacuum leak in the hose that operates the blend door, it would cause the air to blow from the defrost vents only because this is the default.
Thread Starter
|
Senior User
Joined: Aug 2003
Posts: 137
Likes: 0
thanks for the quick responses, what do i have to take apart to get a look at this stuff, i've been used to a 79 so is this stuff going to be a lot more complicated or is it basically all the same just made out of plastic?
