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Thread: Bad Thermostat?

  1. #11
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    What's your coolant level? Have you bleed the air out?

  2. #12
    Senior Member Bitsyncmaster's Avatar
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    If the thermostat froze closed your otterstat would not get hot and the fans would not turn on. But since no coolant is flowing through the radiator, it would not help to have the fans run anyway.

    Your first thing to do it get your temp gauge working. The temp gauge works even if the thermostat is frozen shut. There is coolant flowing in the engine. Try unplugging and plugging in the bulkhead connectors to see if that fixes your temp gauge.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  3. #13
    Junior Member
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    Which bulk head is it specifically?

    Edit: nevermind, I cleaned them all with wd40 and a wire brush, I'm back in business.

    Checking to see if the fans turn on
    Last edited by villevol666; 03-11-2018 at 07:13 PM.

  4. #14
    Junior Member
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    Fan is not turning on. Coolant pipe from the front of the car, i.e pipe with the otterstat is cool too the touch...

    Water pump?

    Edit: antifreeze in overflow tank also cold.
    Last edited by villevol666; 03-11-2018 at 07:23 PM.

  5. #15
    Senior Member DMC5180's Avatar
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    Quote Originally Posted by villevol666 View Post
    Not sure I have anything in place of the blue fail module. Having said that, if the fans work, the otterstat works, the relay works and the fans come on when I jump the otterstat, how could it be fan related?
    At this point, youíre just trying to verify that they do work and that they come on when the otterstat turns them on.

    Assuming you donít have the blue fan fail module, there should be something else plugged into the blue socket. A Y- jumper or Fused Y-jumper at minimum.


    Sent from my iPhone using Tapatalk
    DENNIS

    VIN 5180, Frame 3652, STAGE I, DM-eng Solid State Solutions (RPM Rly, Dm.Lt.Mod., Fan Fail Mod. , FAN Rly, HS.Rly) , HID sealed beam style headlights, SPAX user since 2009, Eibach springs, Mid-State Club Adj. Rear LCA's, DPNW poly-sway bar kit, DMCEU LCA Stabilizer link kit, DMCMW Illuminated door sills, Aussie Illuminated SS Shifter plate, GENUINE MOMO EVO Steering wheel, DELOREANA Extended View Side Mirrors w/ Heaters, DELOREANA LED Door Lights.

  6. #16
    Senior Member DMC5180's Avatar
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    Quote Originally Posted by villevol666 View Post
    Fan is not turning on. Coolant pipe from the front of the car, i.e pipe with the otterstat is cool too the touch...

    Water pump?

    Edit: antifreeze in overflow tank also cold.
    Does that mean your temp gauge is working again?


    Sent from my iPhone using Tapatalk
    DENNIS

    VIN 5180, Frame 3652, STAGE I, DM-eng Solid State Solutions (RPM Rly, Dm.Lt.Mod., Fan Fail Mod. , FAN Rly, HS.Rly) , HID sealed beam style headlights, SPAX user since 2009, Eibach springs, Mid-State Club Adj. Rear LCA's, DPNW poly-sway bar kit, DMCEU LCA Stabilizer link kit, DMCMW Illuminated door sills, Aussie Illuminated SS Shifter plate, GENUINE MOMO EVO Steering wheel, DELOREANA Extended View Side Mirrors w/ Heaters, DELOREANA LED Door Lights.

  7. #17
    Junior Member
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    Yes, temp gauge is working again. Coolant in pipe from radiator never heats up, I'm going to swap the thermostat now.

  8. #18
    Junior Member
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    Thanks for everyone's help, it was the thermostat.

  9. #19
    Senior Member Rich's Avatar
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    Quote Originally Posted by villevol666 View Post
    Thanks for everyone's help, it was the thermostat.
    Way to go. That was a quick resolution by you and the forum team.

    Thanks for the closure report. Glad you'll be back on the road now.
    March '81, 5-speed, black interior

  10. #20
    Delorean Guru
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    Rare for a thermostat to fail but possible. Make sure the new one has a "jiggle pin" and if not at least drill a 1/16" hole in it to pass air so you can bleed the system of air. Watch your coolant level, if you have a leak you can overheat. Bleed the system, at the water pump and the small hose top right side of the radiator. Make sure the header bottle is 1/2 full cold with 50/50 anti-freeze and soft water. Make sure your fans come on and do the relay upgrade and fan fail bypass. If you still have the original radiator with the plastic tanks you should replace it. Ditto for the plastic header bottle.
    David Teitelbaum

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