Question about 1997 GMC Sierra

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Heater control valve 97 GMC Sierra

I have a 1997 GMC Sierra c1500 with a 4.3L V-6. all of a sudden my vents are blowing hot air no matter the position of the temperature control switch. i assumed that it would be my heater control valve that is typically in line with the heater hoses and the heater core. I traced them very thoroughly, and there is no valve! I heard that 95, 96 and 1/2 of 97 have an electronic control valve, but wouldnt it still have to be in line with the heater core? or does it just block the air from flowing past the heater core and the heater core alway has water passing through it? lots of questions please help!

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Yep, air mix door isn't working. Need to figure out how it operates. Some are cables, some are electric. Some may even use manifold vacuum.

Posted on Apr 17, 2017

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Temperature is controlled by an air mix door inside the HVAC compartment. This door is either electrically actuated if you have an electronic climate control system, or a cable for manual control. Most probable cause is a failed electric actuator (air mix door control module).

Posted on Apr 17, 2017

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Posted on Jan 02, 2017

Anonymous

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SOURCE: 93 gmc sierra heater not working

THERMOSTAT REPLACE IF NOT SEE IF HOSES ARE CLOGGED SHOT OF AIR COULD HELP OR DISSCONNECT BATTERY CABLE 10-15 MIN CONNECT BACK TRY HEATER

Posted on Jan 04, 2009

blueextc3221

blueextc3221

  • 15935 Answers

SOURCE: 1986 VW Golf heater blows cold air

The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.
if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.

Posted on Jan 14, 2009

Dissolu

Gintautas Maldzius

  • 221 Answers

SOURCE: Heater Core coolant flow 97 F250 Powerstroke

The one that comes out directly from the engine block

Posted on Jun 23, 2009

Anonymous

  • 55 Answers

SOURCE: heater blow cold air in my 1994 Honda Accord (4

Yes clogged heater core may be the answer in your case .


Posted on Dec 11, 2009

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1 Answer

In my 2007 gmc sierra, when I turn on the air conditioner it blows hot air as if the heater was on in all vents.


The temperature is controlled by the use of an air mix door that is operated by an electric motor/actuator. This door can be jammed or the actuator can be inoperative or have stripped plastic gears internally.

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The blend doors direct air thru the heater core and out thru the vents.

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Replaced the battery on a GMC Sierra 2005. Turned AC on, it cooled for about a minute and started blowing hot air on the driver side, the passenger side blows cold. What does replacing the battery have to...


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1 Answer

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There is, I think, a TSB on this condition that says the temp control door inside the dash air box warps over time and causes it

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