Question about 1998 GMC Blazer

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When engine is started, heater door makes clicking noise for 20 seconds and quits. When engine is shut off, heater door makes clicking noise for 20 seconds and quits. Door makes clicking noise when heat is switched to air conditioning.

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  • sseibert Apr 24, 2009

    How do I get to it to fix it?

  • Anonymous May 03, 2009

    My 94 gmc truck does the same clicking noise. Been doing it for years.

  • Anonymous May 03, 2009

    94 gmc truck

  • Anonymous May 17, 2009

    12-15 hr job what planet are you from?

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Your air temp control blend door actuator is failing, that is the part u call a heater door, it is a gear driven miniature drive, the gears are jumping teeth making the noise, it will stop working very soon.

Posted on Apr 24, 2009

  • yadayada
    yadayada Apr 24, 2009

    You must remove the entire dash assembly, about a 12-15 hour job.

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