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Thread: Temp Goes Up With AC

  1. #1
    Member Midnight Specialist's Avatar
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    Location:  Boston

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    Temp Goes Up With AC

    I recently had my R-12 system charged up and when the AC is running the temp climbs to 220 (and over, if I donít turn it off) once I turn it off, goes back to a little over 160. This happens no matter how Iím driving and with fans on (upgraded fans from delorean parts northwest). I have Dave McKeenís relays and electric otterstat as well.

    I got the air out of the system with the delorean parts northwest bleed kit and still happens. Any ideas on why this is? Could it be just the heat? Been in the upper 90s here in mass.


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  2. #2
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

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    With AC on your fans are running all the time so my guess would be the radiator is not cooling enough. If you have already flushed it and verified your water pump is working, I would think about replacing the radiator.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  3. #3
    Senior Member
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    Quote Originally Posted by Midnight Specialist View Post
    I recently had my R-12 system charged up and when the AC is running the temp climbs to 220 (and over, if I donít turn it off) once I turn it off, goes back to a little over 160. This happens no matter how Iím driving and with fans on (upgraded fans from delorean parts northwest). I have Dave McKeenís relays and electric otterstat as well.

    I got the air out of the system with the delorean parts northwest bleed kit and still happens. Any ideas on why this is? Could it be just the heat? Been in the upper 90s here in mass.


    Sent from my iPhone using Tapatalk
    Possible air flow problem. How clean and open are the fins on condenser and radiator?


    Dave B.

  4. #4
    Member Midnight Specialist's Avatar
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    The radiator is less and a year old and Iíll have to double check the fins on the compressor.


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  5. #5
    TNDMC Founder JBaker4981's Avatar
    Join Date:  May 2011

    Location:  Cookeville, TN

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    What is the possibility that it could be overcharged? I'd think in that scenario that the engine would have to work a lot harder to turn the Compressor pulley.

    My car potentially is experiencing this scenario when on the interstate as it can get to 220 before I shut off the AC and like you, I am running almost everything new for the cooling system. DPI Fans, DPI Radiator, Rebuilt Water Pump, McKeen Relays, etc. (No, there is no air in the system)
    Jesse Baker
    VIN 628
    Black Interior, Automatic
    TNDMC: TN DeLorean Motor Club

  6. #6
    Senior Member
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    The cooling system should be keeping the motor around 180, not 160. Either you have the wrong thermostat, it isn't working correctly, or you are not measuring the temperature accurately. If the temp goes way up with the A/C on, either the fans are not working correctly, not enough air flow, or the A/C system is not right. Is the compressor cycling?
    David Teitelbaum

  7. #7
    Senior Member
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    Location:  Stayton, Oregon 97383

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    Just bypass the otterstat to keep the fans running continuously so you can finally get over the question "are my fans coming on as they should". Once you know the fans are on all the time you can spend your energy looking for other possible solutions. Does it get hot in traffic? Does it run cool on the freeway?

  8. #8
    Senior Member
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    Quote Originally Posted by JBaker4981 View Post
    What is the possibility that it could be overcharged? I'd think in that scenario that the engine would have to work a lot harder to turn the Compressor pulley.

    My car potentially is experiencing this scenario when on the interstate as it can get to 220 before I shut off the AC and like you, I am running almost everything new for the cooling system. DPI Fans, DPI Radiator, Rebuilt Water Pump, McKeen Relays, etc. (No, there is no air in the system)
    Is that a thing? If the AC system is overcharged the engine will have a harder time turning the pulley of the AC Compressor?
    1983 Delorean-auto, black/gray int. 38k miles

  9. #9
    Senior Member
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    Not only is it hard on the motor, It is deadly to the valves in the compressor.
    David Teitelbaum

  10. #10
    Senior Member
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    Quote Originally Posted by David T View Post
    Not only is it hard on the motor, It is deadly to the valves in the compressor.
    wow good to know. Youd think the system wouldnt be able to take more than it can handle. I drained my system entirely and than ran vacuum on my system for an hour or so to burn any moisture. Then I used a can of the redtek stop leak and it took 2 more cans of refrigerent. It blows cold and works perfectly. Slight loss in horsepower that i notice on acceleration but overall everything is good. Wondering if I should connect the gauge manifold to the white cap connector and measure the pressure again
    1983 Delorean-auto, black/gray int. 38k miles

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