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2004 GMC Sierra drivers side only blowing heat

I have my thermostat for both driver and passenger side set on 70 degrees. Passenger side is blowing very cold air but regardless of thermostat for the driver side it blows the hottest the air can get. It has done it before but usually corrects itself so I've never gotten it checked out but living in South Florida now I'm not big on the idea of having my truck blowing heat in my face. Help please!!!

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Posted on Jan 02, 2017

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SOURCE: 2005 GMC air conditioning

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Posted on Sep 23, 2008

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roniecon
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SOURCE: 2004 gmc denali split front air left side blows

add freon it is low

Posted on Jul 03, 2009

  • 1 Answer

SOURCE: Air conditioner blows hot air after 30 seconds on

I have had this problem. I am not a mechanic...so to correct the issue temporarily, I simply turn off the car and restart. This has worked everytime for me. In extreme cases, I think you can also remove the AC fuse and start the car, which will also reset the computer. I also think that by taking the climate control off the "AUTO" setting has worked in the past.

Posted on Oct 27, 2009

  • 44 Answers

SOURCE: 2004 gmc 1500 heat is only blowing on passenger

If the A/C works fine and the issue is only with the heat, check the liquid heat exchangers as the feed from the engine into the A/C area.

Posted on Dec 03, 2009

  • 172 Answers

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

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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