Question about 2003 GMC Yukon XL

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Heater and air conditioning works, but heater only comes on at 90 degrees. When I turn it to 89 degrees or less, air conditioning comes on. There is no happy medium.

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Posted on Jan 02, 2017

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  • 203 Answers

SOURCE: Cold Air with heater On

it could be pushed onto the wrong spline remove the knob turn the spindel back to zero with your hand and then replace it back on with the arrow to zero.joe

Posted on Nov 21, 2008

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  • 7 Answers

SOURCE: cold air coming out car heater, turn heat up to 90

check water level in rad if ok check thermostat or couldbe a plugged heater core.also check for vacum to heater door is working

Posted on Nov 21, 2008

  • 1 Answer

SOURCE: The rear heater does not generate heat - only cold air in vents

I thought I had same problem . . . . until you turn the overhead switch completely to the right which I believe actually trips it to heat mode. hope this helps. Then back to the left copletely for air.

Posted on May 22, 2009

  • 83 Answers

SOURCE: air conditioning silverado

The problem is in the heater box. To be more specific, the blend door. Check blend door operation and blend door motor. Located right side under dash. Remove blend door motor, with vehicle running, move switch from panel to defog and see if blend door motor moves.

Posted on Jul 26, 2009

  • 15 Answers

SOURCE: ford ka heater blows hot air all the time

Your problem is a faulty heater control valve. The design used on these vehicles allows for hot water to flow constantly and compete with the evaporator as there is no blender door. You have to replace the valve and possibly the control head. Meanwhile, you can bypass the valve to have cold air

Posted on Sep 12, 2009

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1 Answer

Intermittent cooling from the air conditioning


If you want a quick check of the blend door system,clamp off the heater hoses,as you would if you were changing a heater core and drive as you would.Do not disconnect them,just clamp them.
Also,don't over look air flow through the a/c condenser at the front,any restriction of air flow or a slow fan or only one running of 2 when 2 are needed?

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Why does my heat blow warm air then it turns cold


its VERY likely that your heater core is getting stopped up.

The heater in your car works by circulating hot water from the engine into a copper or aluminum pipe coiled up in the dashboard. The heater/airconditioner's fan blows across it and the hot air comes out of the vents. This is why the heater doesn't work right away when you first start the car. It usually won't work until the hot/cold needle in the gauges is starting to rise up.

If your mechanic recently replaced the thermostat, its possible that there is air in the system which will result in less antifreeze in the car than it should be. If this is not the case, the heater core is probably stopping up and will require expensive replacement if it cannot be flushed clean.

Check to make sure the car is full of antifreeze IN THE RADIATOR, AND THE OVERFLOW JUG. Please be very sure there is NO AIR in the cooling system as well.

Scott

Jan 22, 2013 | 1998 Ford Expedition

1 Answer

My heater doesn't work. The blower comes on but no heat. Regardless of the setting (60-90 degrees) only cold air. Defrost works to clear windows but no heat.


Most likely your heater core has been clogged up with years of contaminants. The fix here is to pull the heater core, have it flushed or replaced, and put it back.

Dec 25, 2010 | 1994 Cadillac DeVille

1 Answer

I have a 2006 yukon, when I turn the heat to 90 I get heat, when I move it to 89 cool air starts coming out. My mechanic said that when it is on 90 it is going full bore and when I move it to 89 the air...


on the heater vent from the left side you will see a switch ture your heat on then watch the switch when you move the control to 89 see if it moves

Dec 24, 2009 | 1995 GMC Yukon

2 Answers

Heater blows cold air. also, the temperature gage


A thermostat stuck in the open position can cause both of these problems

Nov 12, 2009 | 2002 Chevrolet S-10

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THE HEATER IS NOT BLOWING AIR OUT WHEN TURN ON. IT ONLY BLOE HEATER AIR WHEN THE TEMPERATURE IS TURN TO 90 DEGREE


Your thermostat controlling the heater air needs replacement to get it to function right. This is the one
connected to temperature controller.

Oct 09, 2009 | 2001 Mitsubishi Diamante

3 Answers

Ford ka heater blows hot air all the time


Your problem is a faulty heater control valve. The design used on these vehicles allows for hot water to flow constantly and compete with the evaporator as there is no blender door. You have to replace the valve and possibly the control head. Meanwhile, you can bypass the valve to have cold air

May 31, 2009 | 1999 Ford Taurus

2 Answers

Car only blows cold air


Check temperature heath controltemperature heather controlNTREPID Temperature/Heater Control 2000

Dec 04, 2008 | 2000 Dodge Intrepid

1 Answer

Cold Air with heater On


it could be pushed onto the wrong spline remove the knob turn the spindel back to zero with your hand and then replace it back on with the arrow to zero.joe

Nov 21, 2008 | 2003 GMC Sierra

1 Answer

Cold air coming out car heater, turn heat up to 90


check water level in rad if ok check thermostat or couldbe a plugged heater core.also check for vacum to heater door is working

Nov 13, 2008 | 1998 Mazda Millenia

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