2001 Sonata 4 cyl. heater problem.

Discussion in 'Hyundai Sonata' started by ROCKSROCK, Jan 15, 2006.



    We are experiencing a loss of heat after driving 45 minutes. The dealer
    can't find the problem. Any similar experiences out there? Any
    correlation between using the wipers and the heat problem.
    ROCKSROCK, Jan 15, 2006
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  2. Have you replaced the thermostat? That's the most common cause of
    heating problems.

    If your car has an electronic heater control module like the newer cars
    do, that's also a likely culprit, especially if the heat works
    initially, then malfunctions.
    Brian Nystrom, Jan 15, 2006
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    hyundaitech Guest

    Improper coolant level, clogged heater core, thermostat stuck open. Many
    possibilities. Has your dealer ever been able to experience the no heat
    issue? If not, you may need to provide specific instructions as to how
    they can duplicate. Does it tend to happen to you on a particular stretch
    of road? What type of driving are you doing when it occurs? Try to give
    as many details to your dealer as you can.
    hyundaitech, Jan 16, 2006


    The heater cuts out in inclement weather while we are using the
    windshield wipers.
    ROCKSROCK, Jan 17, 2006

    hyundaitech Guest

    Do you mean that the blower stops or that the air becomes cold?

    There's no link between the heat and the wipers, but it's theoretically
    possible there's an electrical issue affecting the wipers and blower.
    hyundaitech, Jan 17, 2006


    The blower works fine but it blows cold.
    ROCKSROCK, Jan 18, 2006

    hyundaitech Guest

    I'm pretty much at a loss. There's just about zero connection between the
    wipers and heat. It would seem that if the dealer can make it happen,
    they should be able to figure it out while it's happening. Sorry I don't
    have more to offer.
    hyundaitech, Jan 18, 2006
  8. If it's blowing cold air, it would seem that it would have to be a
    problem with the heater control module. Perhaps it's not be reading the
    setting on the temp dial and consequently it's not opening the valve on
    the heater core. I don't know how that would be related to the wipers
    other than they're both electrical issues.
    Brian Nystrom, Jan 18, 2006

    Matt Whiting Guest

    I haven't yet seen a schematic for a Hyundai, but my Chryco minivans
    have several common ground points where several circuits come to a
    common ground. If one of these connections gets corroded between the
    wire terminals and the chassis or comes loose from the chassis, one
    circuit will be trying to use the other circuit as the ground path.
    This can cause seemingly unrelated circuits to "crosstalk" and have
    weird things happen. Maybe Hyunday doesn't use such a wiring
    architecture, but it almost sounds like this.

    Matt Whiting, Jan 19, 2006

    hyundaitech Guest

    If you've got the auto controls, what Brian describes is possible. If
    they're manual, I believe the heater door is vacuum operated.
    hyundaitech, Jan 19, 2006
  11. Does the Sonata use similar controls to those in the Elantra? From what
    I understand, the '01 and up Elantras all have electronic controls,
    although they changed somewhat in '04.
    Brian Nystrom, Jan 19, 2006

    hyundaitech Guest

    I'm not sure whether they're the same. In fact, you're making me question
    whether I was correct on the vacuum operation in my earlier post. The
    manual climate controls are so trouble-free, I'm not sure if I've ever had
    one of the newer ones out. I suppose the way to check is to go to the
    schematics and have a look around.
    hyundaitech, Jan 19, 2006
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