teamzr1 Posted August 23, 2023 Report Share Posted August 23, 2023 HI Car has not been driven for like 1 week, due to the 100 plus daily weather for weeks I cold started the engine and while parked for 5 minutes I than pressed the auto button of HVAC control head. A/C was on but few minutes later the screen of the head showed HVAC wacko in that would cycle everything heat, A/C, fans, defrost, etc Just keeps doing that and even pressing the off button within a minute comes back on and cycles again Even turn the car off for like 5 minutes and starting it again on its own the HVAC keeps cycling, I can tell A/C coming on and off, changes of fans speeds, etc Using OBD1 scanner, find no error codes tripped Any ideas on how to debug/fix this ? Thanks for any ideas ! Quote Link to comment Share on other sites More sharing options...
RubberCarrot Posted August 24, 2023 Report Share Posted August 24, 2023 I don't have the same car but had something kind of similar. I have a 95 Fleetwood Brougham. When I looked at it (a couple times) and drove it all was fine. The day I bought it, I was driving home and noticed the HVAC head was dark! I pulled it out of the dash and opened it up and it actually had a blown capacitor on the board. Split wide open. I suspect you may have a physical problem. Might be worth a look. I bought a used one off EBAY and put the faceplate from my unit on the EBAY chassis. Mine was cleaner. Been working for 12 years now. Knock on wood... Quote Link to comment Share on other sites More sharing options...
sonjaab Posted August 24, 2023 Report Share Posted August 24, 2023 Prob. your climate control has failed. Check for 16v? from the BCM to the controller. Orange and black wire IIRC. If you have this then the climate control unit has failed. Best to hit up your local pic-a-part yard and get a spare. I have had 3 controllers fail on my 93. Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
teamzr1 Posted August 24, 2023 Author Report Share Posted August 24, 2023 Thanks for the replies guys Last night I turned ign key on but engine off and the climate control was off as normal I then started and let engine idle for about 5 minutes and still ECC still stayed off and not doing what it was doing early in the day I did not dare turn A/C on in fear of the ECC going nuts again Wondering if for some reason the ECC could not talk to the BCM, so it was going nuts Here in Texas the weather has been over 100 deg with heat index around 120 deg for like 3 months now and caddy is outside so wondering if some part in ECC or BCM got wacked ? Very odd as when it went wacko even while driving the A/C was coming on and off, fan speeds changing, turning defrost on/off and would never stop doing this sonjaab What is required to take apart what is needed to get to the ECC and take it out and any tips on getting this out with ease ? Quote Link to comment Share on other sites More sharing options...
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