Climate Control
Burning Brakes
Joined: Sep 2004
Posts: 877
Likes: 71
From: Fountain Hills, Arizona
it's easy to remove and they can turn it around in a day.
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Drifting
Joined: Dec 2006
Posts: 1,771
Likes: 1
From: Cuyahoga Falls Ohio
There's a procedure to pull a code from the climate control if that light blinks. I've done it, but it didn't make sense to me.
Mine blinks, sometimes. My AC and heat work, but sometimes I wonder about where it's directing the heat or AC.
Burning Brakes
Joined: Sep 2004
Posts: 877
Likes: 71
From: Fountain Hills, Arizona
Replaced the ECM and the code problems were gone.
Drifting
Joined: Dec 2006
Posts: 1,771
Likes: 1
From: Cuyahoga Falls Ohio
Thats typical when computer boards, chips, PROMS, etc go out, they send you irratic codes and it can drive you crazy. My ECM went out in another C4 and the car was driving rough...every day I pulled a different code and replace several items before it hit me Replaced the ECM and the code problems were gone.
Replaced the ECM and the code problems were gone.I know about pulling codes from the OBDI port.
Melting Slicks
Joined: Feb 2005
Posts: 3,204
Likes: 4
From: Midland Georgia
St. Jude Donor '06
Thats typical when computer boards, chips, PROMS, etc go out, they send you irratic codes and it can drive you crazy. My ECM went out in another C4 and the car was driving rough...every day I pulled a different code and replace several items before it hit me Replaced the ECM and the code problems were gone.
Replaced the ECM and the code problems were gone.
If she is right, that will make Brenda the PROM queen!! 
Put down the top on the olds and wave to the crowd! (Sorry, I could not resist!)
Burning Brakes
Joined: Sep 2004
Posts: 877
Likes: 71
From: Fountain Hills, Arizona
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Burning Brakes
Joined: Sep 2004
Posts: 877
Likes: 71
From: Fountain Hills, Arizona
Code Retrievel is here: https://www.corvetteforum.com/techti...=193&TopicID=2
That link was for the 90-96 models...does it work for the 84-89 models?
Drifting
Joined: Dec 2006
Posts: 1,771
Likes: 1
From: Cuyahoga Falls Ohio
Turn the ignition to run.
In the upper right area of the Heater/AC controls, press the fan up arrow and the down arrow at the same time for 5 seconds.
-00 will display in the LCD. (System parameter)
To examine system parameter errors, press the Auto fan button once.
Next you have to look up C68 diagnostic codes.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
For '88 and '89, push the Outside Air Temp and Auto Button at the same time. A diagnostic mode will appear in the Outside Air Temp Display. Press warm until it shows 08. Press cool for any codes. 00 is no codes. 01 is the Air Mix Door Feedback Circuit (open - no signal); 02 Outside Air Sensor open; 04 Outside Air Sensor shorted; 08 In Car Air Sensor open; 16 In Car Air Sensor shorted. As you can see, there's really not a lot there. Most problems - other than a failure in the Controls or a broken clip or drive gear (usage depends on Year) at the door motor are what plague most older HVAC systems - no gas and or/a worn out compressor.
Melting Slicks
Joined: Feb 2005
Posts: 3,204
Likes: 4
From: Midland Georgia
St. Jude Donor '06
Cruising
Joined: Feb 2007
Posts: 11
Likes: 0
From: Coquitlam B.C.
I looked in my owners manual for a '96 and it said the recirculation feature will not work if the outside temp. is below freezing. On my Vette the light flashed about 5 times and went out. When the temp. went above freezing everything worked fine.
Hope this helps
Hope this helps
