Blend door issue
Thread Starter
Instructor
Joined: Apr 2007
Posts: 160
Likes: 0
From: N Canton Ohio
Blend door issue
Looking for some help, 91 coup, electronic climate control: The blend door is not working. Can't find any issues with the vacuum in the engine dept. cruise works fine. I suspect it's either a relay or the motor itself. How do i get to the motor. Do I remove the knee panel on the passenger side or driver. Also, when the engine is WARM and I'm idling with the AC on i get a bad miss. If I turn the ac off the miss goes away. Is the related? I've cleaned the throttle body already.
Thanks for the help as always!
Thanks for the help as always!
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Drop the PS hush panel and look up a bit. You will see a small motor with a lever going into the climate control housing.
On my prior '88 the plastic fastener holding the lever to the top of the motor shaft had broken allowing the lever to hang down with no contact to the drive motor shaft
With A/C on at idle does the RPM drop substantially?
On my prior '88 the plastic fastener holding the lever to the top of the motor shaft had broken allowing the lever to hang down with no contact to the drive motor shaft
With A/C on at idle does the RPM drop substantially?
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The blend door motor is controlled by the HVAC programmer above the gas pedal. There are two large 340 ohm resistors on the PC board that overheat and can cause the motor to stop working. Check out these links:
http://www.batee.com/corvette/acrepa...oard/index.htm
http://www.misterpeachy.com/VetteStu...rogrammer.html
http://www.batee.com/corvette/acrepa...oard/index.htm
http://www.misterpeachy.com/VetteStu...rogrammer.html
