Question about 1998 Chevrolet C1500

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I have a 98 Chevy c1500 pickup. The AC/Heater control switch will only work on high. First three settings are dead. I bought a new temp control at a junk yard and it does the same thing. any help would be great.

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  • callthefoul Apr 17, 2009

    Stang



    I am not sure I understand your answer.

    Are you saying there is a resistor on the heater blower? or on the temp control?

    if this is on the blower motor this is next to the power red connector on the blower motor???

    If so the only thing on the blower motor is a spade terminal for red and black wires.

    Can you describe exactly what I am looking for?

  • callthefoul Apr 17, 2009

    What is a blower motor resistor and if it is bad how do I find it on my 98 Chevy c1500 pickup?

  • callthefoul Apr 18, 2009

    Stang



    Thanks for the help on this. I replaced the resistor today and that fixed the problem almost!!! If I turn the heater control to high and then to low the the fan will run on low. If I turn the fan to low the fan will not start. Could this be a problem with the fan motor?

  • callthefoul Apr 22, 2009

    Hari86 was dead on. Bought the part for @26.00 installed it the same day and now the heater runs on all four settings. Very good description on how to replace the part.

    Thanks Hari

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Hi..Very common problem on these cars. you need to
replace the blower motor resistor.,it is located on the
pass,side under dash right behind blower motor.
check this out..
thank u..

Posted on Apr 17, 2009

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  • Hariharanath V Apr 17, 2009

    BLOWER MOTOR RESISTOR ASSEMBLY REPLACEMENT

    REMOVAL PROCEDURE



    1. Remove the right side instrument panel insulator.
    2. Disconnect the electrical connector from the blower motor resistor.



    3. Disconnect the electrical connector from the blower motor. IMPORTANT: The blower motor resistor opening is slotted. Access is extremely limited.



    4. Loosen both screws to the forward blower motor resistor.
    5. Remove the rear screw to the blower motor resistor.
    6. Remove the blower motor resistor.

  • Hariharanath V Apr 17, 2009

    INSTALLATION PROCEDURE

    IMPORTANT: Align the blower motor control processor forward retaining slots onto screws and seat the blower motor control processor against the HVAC module.



    1. Install the blower motor resistor. NOTE: Refer to Fastener Notice in Service Precautions.
    2. Install the rear screw to the blower motor resistor. Tighten Tighten all screws to 1.5 N.m (13 lb in) .



    3. Connect the electrical connector to the blower motor.



    4. Connect the electrical connector to the blower motor resistor.
    5. Install the right side instrument panel insulator.

  • Hariharanath V Apr 17, 2009

    hi..Hope your problem is solved.

    thank u..

    rate me..

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  • 221 Answers

It sound's like the blower motor resistor is bad, it's should be connected to the blower motor next to the power connector, you can test it for voltage in all the temp speed setting's to verify, as the temp speed setting's increase the voltage should increase.

Posted on Apr 17, 2009

  • ERIC BAKER Apr 17, 2009

    As you change the speed setting's check for voltage at each of the terminal's of the blower motor resistor connector, if voltage is present and the motor is known to be good the resistor is probably bad and need's to be replaced.

  • ERIC BAKER Apr 17, 2009

    The blower motor resistor might be located behind the glovebox, on top of the ductwork.

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