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  1. #1

    Default 99 Gmc Suburban K2500 7.4 , Electric cooling fan issues

    First off thanks in advance for any help I may receive, My problem is this I have a 1999 GMC suburban K2500 7.4L with front and rear A/C. The electric cooling fan is not working. I am not getting any power to the unit, I have verified that all fuses and relays ( by swapping with starter relay ) are working. I have supplied 12v directly to the fan and it works, I have also replaced the temperature sending unit by the thermostat housing. I feel I am a pretty good do it yourselfer, but my "brain is burning on this".

  2. #2


    little more info on what relay setup your using?
    and what Electric fans are they?
    2000 ECSB Silverado 2WD
    LQ4 with Isky 215 Turbo Cam
    4L80E KB Racing S475 Turbo Kit

  3. #3


    Jonathan, thanks for getting so quick. I am referring to the Factory relays in the engine compartment fuse and relay box and the fan is the cooling fan on the condenser in front of the radiator

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