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2005 GMC Sierra 1500 - heater blows, but only cold air

2005 GMC Sierra 1500 4.8l 55k miles. Blower works in all heat settings, just no hot/warm air. Driver and passenger sides are the same. Feel little to no difference when moving the temp sliders from cold to hot. Is this a fuse/relay problem?

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Marvin Thornbrue

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Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.

Posted on Jan 07, 2010

Testimonial: "You were absolutely correct. Low coolant level. Put in some 50/50 and we're nice and toasty now, but need to find out why coolant was so low. Thanks."

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FastHarley

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Low coolant level.
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2005 GMC Sierra 1500 - heater blows, but only cold - 2005-gmc-sierra-1500-heater-blows-but-qqs2cvuadttosh32a0qzuqom-2-0.jpg

Posted on Feb 13, 2015

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20005 gmc sierra hot on driver side


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  1. Air conditioner system is discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
  2. Air conditioner compressor clutch not engaging. Check compressor clutch wiring, electrical connections and compressor clutch, and repair or replace as necessary.

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