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2004 gmc sierra ext cab 1500. air conditioner, travling down the road ac blowing cold air sometimes will start blowing hot air You can shut off the engine and restart and it will start blowing cold again for awhile.

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6ya6ya
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Posted on Jan 02, 2017

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  • 62 Answers

SOURCE: The air conditioner on the

its the actuators,take to shop tell them to replace.

Posted on Jul 27, 2008

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  • 196 Answers

SOURCE: need to know where sensor 1 (oxygen sensor) on bank 1 is located

It would be on the left header pipe as you sit in the truck. Its the sensor in front of the cat

Posted on Jan 17, 2009

cadman000
  • 607 Answers

SOURCE: a/c and heater only blow air out of defrost

sounds like there is a vacuum leak, possibly under the hood.. Vaccumm is needed to change the mode doors.

Posted on Mar 30, 2009

ronaldo_ross
  • 1056 Answers

SOURCE: 1993 Volvo 850 AC blows cold for a few, then goes hot

It might be low on charge

Posted on Jun 28, 2009

citroenchris
  • 600 Answers

SOURCE: 1998 gmc sonoma air conditioner - not cold

Check the magnetic clutch is engaged on front of a/c pump, have the motor running, a/c on and fan on high, if the centre hub is static the pump in not switched on, this can happen when the gas pressure gets low.

Posted on Aug 05, 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.

Aug 29, 2013 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

I have a cold air leak on the passenger side of my 2004 GMC Sierra 1500. Where is the air coming from and how do I stop it?


Some of these pickups would develop an air leak between the air inlet section of the HVAC box and the cowl or firewall area. This leak would allow cold air to seep into the cab [usually by the passengers feet] in the winter and hot air in the summer. The other rarer cause I've seen is the recirculation door actuator motor sometimes won't hold the recirculation door closed which can also cause a leak. Sorry but I don't have a procedure to fix either of these for you as the ones I saw were still under warranty and went back to the dealers. Hope this helps narrow it down and good luck!

Dec 20, 2010 | 2004 GMC Sierra 1500 Crew Cab

1 Answer

My a/c work but sometime it blows hot on the left side only it


Probably your left temp actuator failed internally. Check the right instrument panel junction block-right side, end of dash-to make sure connectors are fully seated. But thisis usually caused by a faulty temp actuator.

Oct 03, 2009 | 2004 GMC Sierra 1500 Crew Cab

3 Answers

Heater only works on passenger side.


there is a motor actuator that moves these doors for hot and cold, two separate ones for either side. the motor unit for drivers side is no good and needs new one. replace this and all will be good.

Oct 01, 2009 | 2004 Chevrolet Silverado

1 Answer

Poor functioning A/C in 2004 GMC Sierra 1500


Have the engine fans and relays checked. If the engine fan does not come on when the a/c compresser kicks in then the air that comes out the vents will be warm.

Jul 10, 2009 | 2002 GMC Sierra

1 Answer

Blows hot and cold-restart and problem disappears for a while


you need a servicing of the ac condensor, also check that the blower is working or not. your problem will be solved by servicing the condensor.

Jun 20, 2009 | 2004 GMC Sierra

2 Answers

A/c and heater only blow air out of defrost


sounds like there is a vacuum leak, possibly under the hood.. Vaccumm is needed to change the mode doors.

Mar 30, 2009 | 2004 GMC Sierra 1500 Crew Cab

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