erratic climate control

Reply Subscribe

Thread Tools

Search this Thread

Apr 12, 2008 | 10:48 PM

Red C4

Thread Starter

Racer

Joined: Apr 2006

Posts: 378

Likes: 0

From: Whitby Ontario

erratic climate control

I have a '91 coupe , high miles but very well cared for.
I changed the heater core last summer . That of course entails a lot of dash component removal. I put everything back together and all seemed fine. No leaks no squeaks !!
Except the climate control now behaves erratically , it will blow warm for a few minutes then blow cold. Or it will blow cold and then warm .

It seems like it searching for a temp range to maintain.

Does anyone have any suggestions ??

Apr 12, 2008 | 11:51 PM

2012 coupe

Burning Brakes

Joined: Jun 2000

Posts: 913

Likes: 17

From: Chatsworth, Ga.

climate control

If it is the electronic type, pull it out, clean all the contacts, reinstall it, should work OK after that.

Apr 13, 2008 | 08:54 PM

Red C4

Thread Starter

Racer

Joined: Apr 2006

Posts: 378

Likes: 0

From: Whitby Ontario

Thanks I'll try that .

Apr 13, 2008 | 08:56 PM

Tim H.

Instructor

Joined: Dec 2007

Posts: 211

Likes: 2

From: Clarksville MD.

Easy Fix

Follow these instructions and clean the contacts of the unit inside and out.
Did mine and it now works like new.

http://www.c4guru.com/articles/HeadUnitRemoval.pdf

Apr 14, 2008 | 08:34 AM

Red C4

Thread Starter

Racer

Joined: Apr 2006

Posts: 378

Likes: 0

From: Whitby Ontario

Quote:

Originally Posted by Tim H.

Follow these instructions and clean the contacts of the unit inside and out.
Did mine and it now works like new.

http://www.c4guru.com/articles/HeadUnitRemoval.pdf

Thanks Tim, I appreciate the suggestion. The link refers to the stereo head unit. As I have just replaced the Heater Core I am familiar with removal and replacement procedure of just about everything back to the firewall. My climate control head unit responds to each button pushed and I'm thinking it is more likely a sensor.

I am wondering if I may have damaged a sensor while cleaning up in there.
There is a sensor located in the centre vent above the glove compartment that looked very dirty so I cleaned with a Q tip . Also the Sunload sensor looked a little suspect , in that the plastic parts were very brittle from the sun exposure.

Does anyone have any ideas on how to test these or where to source replacement sensors ??