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2007 gmc sierra engine hot ac turned off.the message comes on when my truck is cold and starting

Posted by Anonymous on

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 2000 GMC Sierra 5.3 Litre, won't blow hot air

I experienced the same head ache. First attempt was to replace the thrmostat and after taking it apart I realized that there was nothing wrong with it. I then removed the plastic cover/panel located under the dash board on the passenger's side. (only a few 4-5 smalls screws) Removal will enable you to see the on/off switch/gate moving/rotating as you turn the knob to hot or cold positions, on the control panel. If that switch/gate seems to work ok, then the trouble is within the heater core. Many mechanincs suggested that I replace the heater core. A very expensive proposition.
I checked the heater core supply/intake hose and found it hot to the touch, while the return hose was nearly cold. It was definitely a heater core blockage. I removed both ends (supply and return) hose connections/clamps. They are located near the fire wall in the engine compartment. A special tool is very helpful to remove those clamps easily and to replace them as well. It can be done the old fashion way but this tool was a life saver and reduced work time to just minutes. (Tool is $70.00 bucks at auto parts store,so I borrowed mine from a mechanic/friend)
I then hooked up a garden hose to the return end of the heater core and reversed the flow of coolant/water through the heater core. My truck is a Sierra 2000 and I refuse to see how a heater core could get clogged up with clear coolant alone. To my surprise a flat piece of rubber about the size of a quarter blew out of it and the flow of water became unobstructed. I reconected the ends of the hoses to the heater core, replaced the lost antifreeze & everything returned back to normal. No money spent for something most mechanics suggested I replace control valves/switches ($280.00) replace heater core ($500.00) etc etc. I am glad I was curageous enough to tackle this myself and save a few pennies. Good luck, and I hope this will work for you.

Posted on Dec 02, 2008

  • 6 Answers

SOURCE: 2000 gmc sierra 1500 5.3 v8. a/c heater control problem

your heat/cool and vent selection options are controlled by engine vacuum through small clear tubes attached to the rear of your climate control interface. Other vehicles have small steel pull wires that operate the desired changes. You might try removing the trim and any fasteners affiliated with the interface/console. GENTLY pull outward and look to see if any of these tubes are pulled off or cut/damaged. Did anyone recently install a new stereo in the vehicle? If so, the vacuum tubing and or pull wires that change your outlets could have been damaged when the stereo unit was pushed into place. Hope this helps

Posted on Sep 09, 2009

Testimonial: "Very good information. THANKS!"

  • 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."

  • 593 Answers

SOURCE: My 2004 GMC sierra blows hot air out the drivers

If you've replaced the actuators and they are working.
One of the blend doors may be broken inside the heater box. To repair or replace the broken door you
have to remove the heater box. This is not a small job. The book gives 6-7 hours for the job. There is a
cheat that I've heard good things about. I guess it can
be done in a fraction of the time. You can find out
about it at heatertreater.net I have not used it myself
but I know somone who has. And it worked well for
him. Hope this helps.

Posted on Mar 30, 2010

  • 1 Answer

SOURCE: my gmc sierra says engine hot ac turned off

My truck just did the exact same thing -- and it was a Sensor -- cost me $40.00 to get repaired at a local auto repair shop.

Posted on Sep 28, 2010

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1 Answer

My 95 gmc wont start when hot starts and runs cold


Im guessing it's a 4.3 L engine. Sounds like your coil is acting up when the truck heats up. Bad coil, or small wires going to the coil

Apr 13, 2014 | 1995 GMC Sierra C1500

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Engine hot ac turned off


Sounds like a thermostat problem.

Jan 22, 2014 | 2008 GMC Sierra 1500

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Ac


You would need to find out if the compressor continues to run when the cold air stops.

Jul 17, 2013 | 2000 GMC Sierra

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I have 2003 GMCHD 2500 and the heater is not blowing hot air, turned off the truck and started it again and it will blow hot for 5 seconds and turn to cold again. have you come across this problem before


It is running a test cycle and getting stuck. There are a couple of options. Disconnect the battery, then drive the vehicle around without using the AC for 10 min, if the AC is defaulted to come on after a battery interuption, then shut the car down then turn it on again. You are trying to get the electronic actuator to reset and resume proper function. Another option is to try this: Start the car, adjust the pax side full hot, drivers full cold, wait 30 sec then shut car down, then start car back up and reverse the settings, pax full cold, drivers full hot. In both solutions, the vent actuators are stuck at either the full open or full closed, so you are trying to get it to 'self check' and allow them to resume proper function. After two years, I simply removed them altogether since I live where it is hot an only need cold.works just fine....

Nov 01, 2011 | 2003 GMC Sierra

1 Answer

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...


you have taken the calibration out of sink. you will now have to remove battery power again for about 5 minutes. after this time reconnect the battery. then turn key to on position for 3 minutes but do not touch the heater control or temperature controls. This should allow the heater and ac system to recalibrate. once the 3 minutes is up turn key off and then back on and start truck.. Try your controls again and see what happens. if no change then dealer will have to reprogram the heater control calibration for you.

Jul 18, 2011 | 2005 GMC Sierra

2 Answers

My gmc sierra says engine hot ac turned off


My truck just did the exact same thing -- and it was a Sensor -- cost me $40.00 to get repaired at a local auto repair shop.

Sep 27, 2010 | 2008 GMC Sierra 1500

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

1 Answer

CHECK ENGINE ON AND A/C PROBLEMS


Chances are you have a leak in you AC system and lost the freon.

Mar 21, 2009 | 2001 GMC Sierra 1500HD

1 Answer

Air conditioning


Need to have your HVAC system scanned to determine what has failed in that system. Possible blend door for drivers side or maybe the system just needs recalibrated.

Oct 01, 2008 | 2006 GMC Sierra 1500HD

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