Air conditioning delay
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Air conditioning delay in Past Cadillac Vehicle Discussion; I was wondering if anyone knew how to disable the delay mechanism on my automatic climate control. I believe it's ...
  1. #1
    DaveSmed's Avatar
    DaveSmed is offline Cadillac Owners Connoisseur
    Automobile(s): 1968 Cadillac Sedan deVille, 1994 Chevrolet G20
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    Air conditioning delay

    I was wondering if anyone knew how to disable the delay mechanism on my automatic climate control. I believe it's a 2 part setup, a thermostat on the heater valve and a restrictor tube (orfice tube). I never did understand why further delay was needed after the coolant was hot enough to trip the thermostat, so does anyone know where the orfice tube is located? The big problem is that it affects the air conditioning. Driving around in a boiling car for 10-15 mins before it decides to turn on the A/C is not fun.

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  3. #2
    Katshot's Avatar
    Katshot is offline Cadillac Owners Master
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    Re: Air conditioning delay

    The "delay" mechanism is just a simple thrmostatic switch built into the heater valve as I recall. And that has nothing to do with whether you can get A/C immediately upon request. If you select A/C and it doesn't come on, there's a problem.

  4. #3
    BeelzeBob's Avatar
    BeelzeBob is offline I'm a Cadillac Fanatic!
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    Re: Air conditioning delay

    Yeah, even on the hottest days here in New York - and it DOES get very hot - my a/c comes on right away. It's so noticable that my girlfriend is a bit jealous! She drives a '99 Volkswagen Passat...
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  5. #4
    DaveSmed's Avatar
    DaveSmed is offline Cadillac Owners Connoisseur
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    Thread Starter
    I had found the switch and jumped it out, but it still was delayed, even for the heat side of things. Hmm.... maybe after the hurricane I'll check on the hoses. Right now I'm trying to figure out how to keep my car cover from turning into a Cadillac-sized kite

  6. #5
    DaveSmed's Avatar
    DaveSmed is offline Cadillac Owners Connoisseur
    Automobile(s): 1968 Cadillac Sedan deVille, 1994 Chevrolet G20
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    Thread Starter
    I just found my Factory service manual, which served to confuse me more. In addition to the restrictor I suspected, theres also a Time Delay Relay which looks like it SHOULD be easy to find, but seems to be MIA. Here's the vacuum schematic for the Automatic Climate Control from the FSM. 7 on the control head is the vacuum source. (Yellow stripe)


  7. #6
    Leloz is offline Cadillac Owners Enthusiast
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    I used to have this problem in my 75 Fleetwood Brougham and it turned out to be a stuck dash seal for the vents.

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