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1969 A/C always on... even with key off????

Forum: C3 HVAC, Fuel, Emissions, and Exhaust

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1969 A/C always on... even with key off????

Posted: 2/10/26 7:06pmMessage 1 of 3
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Stearns
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Roseville, CA - USA
Joined: 3/5/2011
Posts: 10
Vette(s): 1969 Coupe, 350 - (388 now), A/C, PS, PB, AT, Electric Windows, Shoulder Belts, Kandy Brandy Wine - Black Interior, T-Top, Astro V, Original Owner.
My 69 Vet the A/C is always on even with ignition key off. Any ideas? Could it be the blower motor switch/relay/resistor????
 
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Brian Stearns
Roseville, CA

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Re: 1969 A/C always on... even with key off????

Posted: 2/10/26 9:16pmMessage 2 of 3
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22743
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Do you mean the blower fan is always running? If so, does it run on high speed? If it stays on, blowing on high speed, chances are the high blower relay is stuck on. It has 12v all the time, coming from the alternator connection to the battery. If the relay gets stuck, it will power the blower all the time. The connector can get hot, and melt, so take a look and see if that is the issue.

Joel Adams
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Re: 1969 A/C always on... even with key off????

Posted: 2/10/26 9:28pmMessage 3 of 3
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F4Gary
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Grapevine, TX - USA
Joined: 8/26/2006
Posts: 1579
Vette(s): 1972 LT-1 convertible with factory air. 2017 Black Rose Grand Sport M7 convertible.
My guess is the contacts that put it in MAX. As you roll the selector wheel from MAX to OFF it is not de-energizing the contacts. I would be checking the the controller in the console.

The contacts on the left side of the controller.

   

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