89 electronic air conditioning problem

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Jan 19, 2004 | 11:47 PM

tomcat I

Thread Starter

2nd Gear

Joined: Jan 2004

Posts: 2

Likes: 0

From: oakhurst ca

89 electronic air conditioning problem

has anyone had this problem. when i call for heating all i get is cold air
temp valve actuator is not moving the door to the heater core.
could it be the programmer
thanks tomcat :

Jan 20, 2004 | 01:50 PM

ZylaRace

Drifting

Joined: Mar 1999

Posts: 1,931

Likes: 1

From: Norcross GA

Re: 89 electronic air conditioning problem (tomcat I)

There is a good chance it is.
Remove the programmer and open it up. There are a couple high wattage resistors that develope cold solder joints over time. The easy fix is to reflow the solder. (Remelt the solder and let it cool.)
Reinstall and give it a try.
Also,.. dump (press a few buttons) the codes from the electronic unit. i.e. See what it say's.

Jan 20, 2004 | 02:05 PM

brookman

Burning Brakes

Joined: Aug 2002

Posts: 926

Likes: 2

From: chandler az

Re: 89 electronic air conditioning problem (tomcat I)

can you see the actuator moving? Mine was stuck on full hot.

http://brookins.us/heater.jpg

the rod was just sliding in the plastic puck. I positioned it correctly and superglued it in place.

Jan 20, 2004 | 11:30 PM

Coupe89

Melting Slicks

Joined: Sep 2001

Posts: 3,494

Likes: 36

From: Livermore Ca

St. Jude Donor '05-'06

Re: 89 electronic air conditioning problem (brookman)

Its the programmer.
Mine was stuck on hot
I just pulled mine last weekend.
One of the resistors had work it self looses.
Now I get hot and cold :D

Jan 20, 2004 | 11:39 PM

tomcat I

Thread Starter

2nd Gear

Joined: Jan 2004

Posts: 2

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From: oakhurst ca

Re: 89 electronic air conditioning problem (Coupe89)

how hard was it to remove the programmer
thanks mike

Jan 21, 2004 | 12:26 AM

SunCr

Le Mans Master

Joined: Dec 2000

Posts: 7,839

Likes: 22

From: San Diego, Ca

Re: 89 electronic air conditioning problem (tomcat I)

Remove driver's side hush panel - programmer is above & to the right of the accelerator. It's approximately 3 X 5. Before careful removing the vacuum harness after you unbolt it. Before replacing, just make sure the linkage from the temperature door motor to the door is intact. It's on the passenger's side. Remove the passenger's side hush panel to access. There shouldn't be any play in it and as you or someone operates the controls, you should be able to see it move (If the motor is working). Also, is the outside temp light flashing? A bum motor or an open in the motor circuit may set a trouble code. To access, hold the ext temp button while pressing and releasing the auto button. Press warm until the display shows 08. Press the cool button and the trouble codes will be displayed: 00 - No Faults; 01 Air door feedback open; 02 Outside Temp Sensor open; 04 Outside Temp Sensor shorted; 08 Inside Temp Sensor open; 16 Inside Temp Sensor shorted. If you do replace the programmer, disconnect the battery to reset the memory in the dash panel and after you start it, there will be a delay while the panel learns the position of the door. The temp readout may also, momentarily, read -32.

Jan 21, 2004 | 12:29 AM

vette92_1

Burning Brakes

Joined: Jul 2002

Posts: 972

Likes: 0

From: Springdale AR

Re: 89 electronic air conditioning problem (tomcat I)

Yours being an 89, I don't know if you have the same heater door motor that my 92 has but read this post, this is what happened to mine.

http://forums.corvetteforum.com/zerothread?id=729036