Temp Controls not working.
Thread Starter
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
Temp Controls not working.
On my 91 Vette, the Temp controls suddenly stopped directing the air to the correct button position.
My 91 has the Manual cold/warm lever selector which opens the cold/hot air correctly but, it seems the electronic airflow buttons are stuck on the defrost/knee position. The air flow will not switch to any other vent position. Everything was working fine last night.
Do I need to replace/clean the temp controller? Thanks
My 91 has the Manual cold/warm lever selector which opens the cold/hot air correctly but, it seems the electronic airflow buttons are stuck on the defrost/knee position. The air flow will not switch to any other vent position. Everything was working fine last night.
Do I need to replace/clean the temp controller? Thanks
Racer
Joined: Nov 2010
Posts: 460
Likes: 1
From: Oliphant Ontario
May just be no vacuum, the full climate control uses it, I think yours does too. Uses engine vacuum to move the air doors to the requested location, no vacuum and the doors default to defrost.
Look for a tiny vacuum line under the hood, passenger side, should T in there somewhere. It's about the size of a 14G insulated wire and is hard plastic, not rubber.
Greg
Look for a tiny vacuum line under the hood, passenger side, should T in there somewhere. It's about the size of a 14G insulated wire and is hard plastic, not rubber.
Greg
Racer
Joined: Sep 2010
Posts: 310
Likes: 0
From: Morehead Ky
Like Sarge said, You may want to look into cleaning the contact on the climate contol unit. A lot of us have done it and the most common symptom is the temp up or temp down buttons fail. Here is a great guide. Good Luck.
http://forums.corvetteforum.com/c4-g...on-repair.html
http://forums.corvetteforum.com/c4-g...on-repair.html
Thread Starter
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
Like Sarge said, You may want to look into cleaning the contact on the climate contol unit. A lot of us have done it and the most common symptom is the temp up or temp down buttons fail. Here is a great guide. Good Luck.
http://forums.corvetteforum.com/c4-g...on-repair.html
http://forums.corvetteforum.com/c4-g...on-repair.html
I'll take the climate control apart tomorrow.
Thread Starter
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
Well, I took my "91" Vette manual electronic temp control box out but, I found there are no contacts to be cleaned.
The individual push buttons press a solid white plastic button on the inside of the box that presses a mechanical switch soldered to the circuit board. It's not like a modern TV remote or computer keyboard where there are copper contacts to be cleaned. The buttons are all assembled inside a stamped steel cage and there is no way to take it apart.
Also, I found to remove the manual warm/cold cable, you have to first remove the glove box door and tray. Inside you'll see the cable end, just pull the cable from the plastic adjuster guide, slip the end of the cable off the end linkage and then you will have enough slack to remove the cable linkage from the control box too remove it from the dash.
I ordered a new Heater/AC control box from Corvette Central. Hope this helps someone else.
The individual push buttons press a solid white plastic button on the inside of the box that presses a mechanical switch soldered to the circuit board. It's not like a modern TV remote or computer keyboard where there are copper contacts to be cleaned. The buttons are all assembled inside a stamped steel cage and there is no way to take it apart.
Also, I found to remove the manual warm/cold cable, you have to first remove the glove box door and tray. Inside you'll see the cable end, just pull the cable from the plastic adjuster guide, slip the end of the cable off the end linkage and then you will have enough slack to remove the cable linkage from the control box too remove it from the dash.
I ordered a new Heater/AC control box from Corvette Central. Hope this helps someone else.
Last edited by GKK; Jan 21, 2011 at 07:12 PM.
