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    ViVid's Avatar
    ViVid Posts: 31, Reputation: 0
    Junior Member
    		  
    #1

    Dec 5, 2007, 02:14 AM
    Gmc heat
    I have a 2004 gmc truck but my heater stops working when the engine rpms runs below 1500 rpms(idaling)the fan works great but blows cold air :eek:
    CaptainRich's Avatar
    CaptainRich Posts: 4,492, Reputation: 537
    Cars & Trucks Expert
    		  
    #2

    Dec 5, 2007, 06:34 AM
    Quote Originally Posted by ViVid
    i have a 2004 gmc truck but my heater stops working when the engine rpms runs below 1500 rpms(idaling)the fan works great but blows cold air :eek:
    Check for low coolant level and check for the proper concentration mix.
    Going on 4 years old, have you replaced the thermostat yet?
    Make certain the hoses are getting hot: coolant should be flowing freely.
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