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  #1  
Old 06-12-2009, 01:19 PM
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Default My Heater Blows Cold Air...WTH?????????

2000 Silverado Reg Cab V6 blows cold air when temp control is set to hot. The beauty is I am staying cool in the 90 degree Oklahoma Heat, but one day it will be cold outside and need some toasties.

What do I replace? Help a brother troubleshoot. I just bought this truck from a used car dealer last Saturday and figured out this problem. I guess that's what I get for selling my 2007 Tacoma.

Any help would be much appreciated.
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  #2  
Old 06-12-2009, 06:58 PM
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Quote:
Originally Posted by jclarkland View Post
2000 Silverado Reg Cab V6 blows cold air when temp control is set to hot. The beauty is I am staying cool in the 90 degree Oklahoma Heat, but one day it will be cold outside and need some toasties.

What do I replace? Help a brother troubleshoot. I just bought this truck from a used car dealer last Saturday and figured out this problem. I guess that's what I get for selling my 2007 Tacoma.

Any help would be much appreciated.
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  #3  
Old 06-13-2009, 05:38 PM
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Clogged heater core or bypassed???
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  #4  
Old 06-13-2009, 06:53 PM
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Sounds like a bypassed heater core.
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  #5  
Old 06-14-2009, 07:57 AM
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What is a "bypassed" heater core. What do I do bout it?? I hear it is a biznich to replace.
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  #6  
Old 06-14-2009, 08:20 PM
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A bypassed heater core is not going to blow cold air in 90 degree heat. It will blow the temp of the outside air. I would check the control head to make sure it is actually switching to heat and that the compressor is off when on heat. Do you have the "A/C" button off?
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  #7  
Old 06-15-2009, 10:39 AM
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What is the best way to test the control unit? I don't hear any change when I switch from A/C to heat and back. I should hear it click on and off right?

BTW coolant is new and topped off.
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Old 06-15-2009, 10:39 AM
 
 
 
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05, air, blow, blowing, blows, cold, cool, core, gmc, heat, heater, sierra, silverado, toyota, tundra, xl, yukon

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