Heater A/C Control
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Joined: Nov 2013
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From: Casper WY.
Heater A/C Control
I have a 91. After having a new stereo installed the heater control just shows a solid yellow light with nothing else in the LED display. I put in another heater control head and it's still the same thing. I have checked the wiring and everything looks good. Anyone have experience with something like this?
k
k
Melting Slicks
Joined: Sep 2008
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From: Cherokee National Forest TN
90 through 93(? unsure of the last year) require resistors added in series to several of the radio feed wires when a non Bose unit is installed. Failure to install the resistors results in a non functioning AC control.
A GM TSB with wiring diagram showing where the resistors are to be installed is posted on this forum somewhere in the stickys section on top of the topic pages.
I purchased the correct ohm resistors @ radio shack, cost about 2.50.
Link to the TSB:
http://www.corvetteforum.net/c4/dave8476/index4.shtml
A GM TSB with wiring diagram showing where the resistors are to be installed is posted on this forum somewhere in the stickys section on top of the topic pages.
I purchased the correct ohm resistors @ radio shack, cost about 2.50.
Link to the TSB:
http://www.corvetteforum.net/c4/dave8476/index4.shtml
Last edited by Churchkey; Feb 3, 2015 at 06:21 PM. Reason: add link
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Joined: May 2014
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From: Raleigh NC
I never would have thought this was because of the radio.... Every now and again when i start up the car, I get the bars on the A/C controls screen so I just cycle the switch until it goes away. Nice to know there is a real fix. Looks like i need to hit up Radio Shack and figure out where the resistors go on a 90.
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Joined: Nov 2013
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From: Casper WY.
I printed the diagram. I appreciate the help. The person whom installed the stereo didn't do a good job with the stereo so I doubt he got that right.
Thanks again everyone for all the input
Thanks again everyone for all the input
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Joined: May 2014
Posts: 75
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From: Raleigh NC
I saw where the resistors go, but I don't know what circuit 300 is to grab the switched 12v. Can I tap into the radio's main feed switched 12v? I believe it's yellow... I've had other issues more pressing, but this would be an easy satisfying fix. Unlike my other issues...
-Jason
-Jason
