hvac issue
Thread Starter
Racer
Joined: Oct 2011
Posts: 392
Likes: 6
From: woodstock ga
hvac issue
89 with climate control is stuck on heat mode. i have had the controller (head unit) rebuilt. i have replaced the air mix door motor. worked one time and is locked on heat mode again. the air flow will change to selected vents but will not cool when dialed to 65 degree setting.
i am wandering if the air mix door could be binding and causing the cotroller and or air mix door to bur out? any help out there?
i am wandering if the air mix door could be binding and causing the cotroller and or air mix door to bur out? any help out there?
Instructor
Joined: Dec 2010
Posts: 138
Likes: 1
On my 87, the programmer is where an emergency brake would be. Left hand side of the drivers side. Find the hood release, the programmer is basically down from that. 
It is about 4 inches or so square. It has a bunch of hoses coming out of it.
Good luck.
It is about 4 inches or so square. It has a bunch of hoses coming out of it.
Good luck.
Thread Starter
Racer
Joined: Oct 2011
Posts: 392
Likes: 6
From: woodstock ga
took the programmer out and sure enough it had 2 resistors that appeared to have burned. flash spots around them with the printed circuit board discolored. took it to a local t/v repair shop and he re soldered the connections, at no charge. i gave him 10 bucks for lunch. installed the programmer in the car and it works beautiful. thanks to all CF members that helped with this!!!!!
3rd Gear
Joined: Nov 2011
Posts: 3
Likes: 0
First time to the forum. Thanks for the information. My 89's heater would burn you out when ever it wanted. The programmer had a cold solder on one of the resistors. I was able to fix it myself. It came out easy, I unpluged the vacuum lines from inside the unit. It all was easer than I thought it would be to fix.
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Thread Starter
Racer
Joined: Oct 2011
Posts: 392
Likes: 6
From: woodstock ga
mjsvet,
what happened? you said it was working, did it work correctly after you repaired the cold solder resistors? Mine works great after i had the resistors re soldered. perhaps they came loose again? if not then i would go toward a bad or sticking air blend door actuator. I paid $125 for one that i dont need. i would be happy to sell and send it to you. before you buy get an opinion other than mine as i am only guessing.
what happened? you said it was working, did it work correctly after you repaired the cold solder resistors? Mine works great after i had the resistors re soldered. perhaps they came loose again? if not then i would go toward a bad or sticking air blend door actuator. I paid $125 for one that i dont need. i would be happy to sell and send it to you. before you buy get an opinion other than mine as i am only guessing.
