Heat always on
Thread Starter
5th Gear
Joined: Apr 2009
Posts: 5
Likes: 0
Heat always on
Can anyone tell me why I can not control the temperature inside my 89.
The control panel seems to work fine. I can increase the temperature on the control panel and hear the A/C unit shut off, but when ac is needed
hot air comes out of the ducts as if the heat is on. It seems as if a damper door is stuck open
Thanks
The control panel seems to work fine. I can increase the temperature on the control panel and hear the A/C unit shut off, but when ac is needed
hot air comes out of the ducts as if the heat is on. It seems as if a damper door is stuck open
Thanks
Pro
Joined: Mar 2008
Posts: 579
Likes: 2
From: High Bridge New Jersey
Team Owner
Joined: Oct 2000
Posts: 96,443
Likes: 9
From: Fort Knox, KY
Cruise-In IV Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
Cruise-In VIII Veteran
A possible quick item to check. Open your fuse panel (passenger side) and remove the fuse marked CLIMATE for 30 seconds, then re-install.
Turn on the ignition and start the engine. This resets your climate control HVAC damper to its default position.
You should be able to verify movement of the damper door through the entire temperature range.
Turn on the ignition and start the engine. This resets your climate control HVAC damper to its default position.
You should be able to verify movement of the damper door through the entire temperature range.
Pro
Joined: Oct 2005
Posts: 721
Likes: 1
From: Charlotte NC, behind someone going 10 under the speed limit
This is one way to see if your temp control rod fell off....
You can take the car out and throw it into some hard left/right turns and see if the heat goes away. I think the hard left makes the door flip to cold, then right makes it move to heat. If hard truns give a change in temp you've got a actuator rod that has fallen off. If not the door may not be loose enough for this test to work, but it worked on my 88. HTH
You can take the car out and throw it into some hard left/right turns and see if the heat goes away. I think the hard left makes the door flip to cold, then right makes it move to heat. If hard truns give a change in temp you've got a actuator rod that has fallen off. If not the door may not be loose enough for this test to work, but it worked on my 88. HTH
Thread Starter
5th Gear
Joined: Apr 2009
Posts: 5
Likes: 0
Thanks! I found the problem. There is a controller under the dash on the drivers side. Would only energize on the heat side. Cold side dead. I ordered one from Rock Auto. Least expensive found on search
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
