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Thread: Heat/AC question

  1. #1
    Junior Member rick1083's Avatar
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    Heat/AC question

    I was driving my Delorean today and I turned the heat on. After a few minutes, and I thought I was crazy for a second, I thought I saw a little smoke coming from the engine bay. The temperature gauge was good so I wasnít overheating. Then I noticed the heat stopped working. I did notice a little bit of a smell too. I then gave the air conditioning a try and that isnít working either. I never observed smoke again when I had the heat/ac switch set to off. Any ideas on what this could be? And is the car still safe to drive so I can take it to have it fixed? Iím kind of a novice right now.

  2. #2
    Senior Member DMC5180's Avatar
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    Quote Originally Posted by rick1083 View Post
    I was driving my Delorean today and I turned the heat on. After a few minutes, and I thought I was crazy for a second, I thought I saw a little smoke coming from the engine bay. The temperature gauge was good so I wasnít overheating. Then I noticed the heat stopped working. I did notice a little bit of a smell too. I then gave the air conditioning a try and that isnít working either. I never observed smoke again when I had the heat/ac switch set to off. Any ideas on what this could be? And is the car still safe to drive so I can take it to have it fixed? Iím kind of a novice right now.
    Define the heat stopped working?

    Hot Coolant flows through the heater core continuously, except when in A/C max. ( heater valve is closed )

    Does the cabin fan work or did it stop blowing air?
    DENNIS

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

  3. #3
    Junior Member rick1083's Avatar
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    Quote Originally Posted by DMC5180 View Post
    Define the heat stopped working?

    Hot Coolant flows through the heater core continuously, except when in A/C max. ( heater valve is closed )

    Does the cabin fan work or did it stop blowing air?

    I get no air blowing out at all. Doesnít matter if itís set to 1, 2, 3 or 4.

  4. #4
    Senior Member DMC5180's Avatar
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    Check the blower motor power and grounding connections at the motor.

    Itís above the passenger feet.

    Also check the Green 30 amp fuse connection.
    DENNIS

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

  5. #5
    Under Ron's watchful eye. Glory be to Ron! Michael's Avatar
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    Could be coolant or electrical(very different and distinct odors)...being the blower is not working at all and AC stopped, I'm going with electrical. If it was bad enough to actually cause visible smoke from the engine bay then it's much more serious than popping a fuse. You should see some evidence of melted wires, insulation, a melted wiring harness sheath. It is possible that the odor and smoke came from the relay compartment and the smoke you thought was in the engine bay was directly behind you (assuming you were in the car at the time of the discovery), so check the relay compartment. Look closely at the fuse and the breaker first.

  6. #6
    Delorean Guru
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    The smoke you saw *could* be a coolant leak and it is dripping onto a hot surface like an exhaust pipe. Check the hoses and heater valve in front of the motor. As for the no air blowing, figure out why the blower motor isn't working. First step would be to see if you have any voltage at the connections to the motor. Check the coolant level. If it is OK the car is safe to drive.
    David Teitelbaum

  7. #7
    Administrator Ron's Avatar
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    Quote Originally Posted by Michael View Post
    Could be coolant or electrical(very different and distinct odors)...being the blower is not working at all and AC stopped, I'm going with electrical. If it was bad enough to actually cause visible smoke from the engine bay then it's much more serious than popping a fuse. You should see some evidence of melted wires, insulation, a melted wiring harness sheath. It is possible that the odor and smoke came from the relay compartment and the smoke you thought was in the engine bay was directly behind you (assuming you were in the car at the time of the discovery), so check the relay compartment. Look closely at the fuse and the breaker first.
    +1

    ======
    The coolant level shouldn't have anything to do with the blower not working.
    The fluid level being OK doesn't have anything to do with whether it is safe to drive it or not!
    If you shut it off right away and haven't tried it again, the thermal breaker may have cooled and reset. If so, be prepared to see more smoke, I.E., be able to disconnect the battery quickly...use a fire extinguisher. Better safe than sorry.....

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