Have I got a short?????
Thread Starter
Racer
Joined: May 2004
Posts: 385
Likes: 1
From: Olalla Wa
Have I got a short?????
Problem just started on my 91 coupe. Car has the electronic climate control and if any button other than"off" is pushed the primary fan starts and won't stop unless I stop the car and resart with the system off. This will happen when the car is cold also,so I'm thinking I've got a short somewhere???? This will only happen when the car is running,if the key is turned on I can then push any button and no fan comes on,but once I start it up on comes the fan!!! any thoughts 
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Have I got a short????? (myblue91)
It sounds like the HVAC control head is FUBAR; do all the functions work otherwise? If not, you can try pulling it and cleaning the PC board contacts.
I finally had to replace mine to cure problems with it; I got a used one from Contemporary Corvette (link on my site).
I finally had to replace mine to cure problems with it; I got a used one from Contemporary Corvette (link on my site).
Thread Starter
Racer
Joined: May 2004
Posts: 385
Likes: 1
From: Olalla Wa
Re: Have I got a short????? (65Z01)
Thanks for the quick reply...all the functions work, the a/c hasn't worked for awhile ,but the heat does(need this more than ac in Wash.) Where is the control head? Thanks... 
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Have I got a short????? (myblue91)
On my '88 the HVAC control is behind the front buttons. I had to pull the center bezel to access the screws holding the HVAC control assy.
Once it is removed the case can be opened to expose the PC board card edge connectors.
You can put the HVAC into test mode (method in Tech Tips I believe) to see check it out).
Also you can pull the ECM codes to see if there is some other reason the fan is coming on.
Once it is removed the case can be opened to expose the PC board card edge connectors.
You can put the HVAC into test mode (method in Tech Tips I believe) to see check it out).
Also you can pull the ECM codes to see if there is some other reason the fan is coming on.
Melting Slicks
Joined: May 2004
Posts: 2,524
Likes: 10
From: Lufkin Texas
St. Jude Donor '05-'06
Re: Have I got a short????? (myblue91)
Just for poopies and giggles, since your AC is not working try unplugging the high pressure switch plug on the high side ac line under hood..if its stuck grounding it could be telling fan relay to kick on..I'm not sure if it would only do it when you turn on ac controller or not but it may be worth trying.
Thread Starter
Racer
Joined: May 2004
Posts: 385
Likes: 1
From: Olalla Wa
Re: Have I got a short????? (skateparkdave)
Skatepark-I'm going to try that when I get home tonite...After doing some reading and making some calls that suggestion keeps coming up. By the way, thanks for your help with my aux.fan switch installation(works great!!) 
Melting Slicks
Joined: May 2004
Posts: 2,524
Likes: 10
From: Lufkin Texas
St. Jude Donor '05-'06
Re: Have I got a short????? (myblue91)
Ok good!! I'm glad my help with your manual fan switch works 
..keep us posted on what you find on this deal..we're all just helping each other learn these animals 
Dave
[Modified by skateparkdave, 10:04 PM 6/21/2004]
..keep us posted on what you find on this deal..we're all just helping each other learn these animals Dave
[Modified by skateparkdave, 10:04 PM 6/21/2004]
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I thought that might be it.. I'm glad that worked for you..thanks for reporting back.
