C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Electronic Climate Control Experts Needed

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Old Dec 2, 2003 | 07:33 PM
  #1  
rhodginz's Avatar
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Default Electronic Climate Control Experts Needed

I'm having adjusting the temperature on my ECC. There's no problem decreasing the temperature, but when I try to increase the temperature, it does nothing. I can press on the button all I want, but the temp will only go down. Hold the phone!! I just went out to the car, a '95 coupe, turned the key on, and was able to adjust the temp up. What in the heck is going on? Everything else seems to work perfectly on the ECC.

HELP!!!!!
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Old Dec 2, 2003 | 07:39 PM
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Default Re: Electronic Climate Control Experts Needed (rhodginz)

Theres a somewhat-long procedure in the shop manual to figure these things out, its likely a bad connection somewhere though.

Remove the unit and clean the contacts with an eraser, that sometimes does it. Otherwise I bet its a faulty unit or a loss of ground somewhere.
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Old Dec 3, 2003 | 11:39 AM
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Default Re: Electronic Climate Control Experts Needed (rhodginz)

I had this problem on mine....sometimes you could turn the temp up, but not down, other times it worked fine. If you smacked the dash it might start working again, or maybe not....

What solved it, I cant guarantee this will work on yours....

Is I removed the climate control unit above the radio. I then opened up the case, removed the face (face being the display/button front you see) from the circuit board buy pulling it off. It has pin connectors....

I cleaned the connectors, although I didnt see any problems with corrosion, then put it back on. Reinstalled the climate control unit, and magically it worked..

Good luck. BTW I have a 1993 LT-1 vert.
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Old Dec 3, 2003 | 11:57 AM
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Default Re: Electronic Climate Control Experts Needed (dizwiz24)

Me Too.

Mine occasionally doesn't work. I don't know why. I wonder if there are some ambient conditions that affect when the controls can be changed.

:confused:
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Old Dec 3, 2003 | 03:06 PM
  #5  
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Default Re: Electronic Climate Control Experts Needed (NeedSpeed)

disconnect the battery for a min of 15 seconds, this resets the AC programmer...worked for me :thumbs:
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Old Dec 3, 2003 | 03:47 PM
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Default Re: Electronic Climate Control Experts Needed (corvette90)

disconnect the battery for a min of 15 seconds, this resets the AC programmer...worked for me :thumbs:
:withstupid: Thats what I do too. Or I just ignore it for a couple of minutes while I am driving and then it will work as well. It is the AC Gremlin. :D
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Old Dec 3, 2003 | 04:42 PM
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Default Re: Electronic Climate Control Experts Needed (rhodginz)

My '94 had the exact same symptoms as yours. I dissasembled it and cleaned the contacts with alcohol. I have used this procedure to fix the control heads on various cars that I've own over the part 15 years. I have one recommendation - Use pure alcohol - as opposed to rubbing alcohol, which has oil in it to make it "rub" nicely. I worry about the oil eventually causing the same condition. I believe that some of the gas-line antifreeze products are pure methyl or isopropyl alcohol.
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