Question about GMC Denali

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I have a 1999 gmc denali the a/c and heat doesn't work.. The blower works... I had thermostat changed and heater control valve

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  • 129 Answers

May need.heater core flushed out.

Posted on Nov 29, 2012

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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: heater blower motor sometimes works

Check to make sure your wires are connected if so you may need to replace the blower motor

Posted on Nov 23, 2008

picatudo
  • 239 Answers

SOURCE: 2001 gmc jimmy defroster-heater blower will not direct heat

you have a vacuum leak

Posted on Jan 07, 2009

carfreak1217
  • 109 Answers

SOURCE: 1999 yukon denali front blower motor not working

Check Fuse #3 in the under hood fuse block it is the only common connection I can make.

Posted on Jun 28, 2009

  • 490 Answers

SOURCE: AC blowers in dashboard of 2006 Envoy Denaly do not work anymore

Check your fuses.

Posted on Aug 11, 2009

jsmes1027
  • 749 Answers

SOURCE: 2005 GMC Yukon Denali XL - Climate Control issue-

Are you aware of any codes that may stored in the body control module and do you hear a clicking or ticking noise in the rear?

Posted on Nov 02, 2010

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1 Answer

1994 GMC Yukon heat


This could be 1 of 2 things 1 being the heater control valve and the other is the heater core is clogged up.

Jan 20, 2012 | 1994 GMC Yukon

1 Answer

The rear A/C works but the heat does not on my 04 yukon.


Could be the swap valve/damper not opening to allow air to flow thru heater core in rear or control switch not telling it to change.

Oct 30, 2011 | 2004 GMC Yukon

1 Answer

1999 denali dummy gauge turned on, vehicleoverheating gauge started to show hot, attempted to turn heater on to releave heating but heater blew cold air only.


Your coolant is to low to allow heating...not water to heat up or cool the engine. Check the coolant resevior/radiator after the engine is cooled and then refill with anti-freeze. this should solve the problem...if not, you have a sticking thermostat or a clogged radiator. Good luck

Feb 11, 2011 | 1999 GMC Denali

1 Answer

Heat and air blower works no heat


It could be a bad thermostat.

or

malfunctioning heater control valve/ linkage between the heater control and the control valve

Jan 21, 2011 | 1999 Dodge Ram

1 Answer

My heat does not work in my 2000 yukon xl. I have


bad control valve or plugged heater core

Dec 31, 2009 | 1999 GMC Jimmy

1 Answer

1999 yukon denali front blower motor not working


Check Fuse #3 in the under hood fuse block it is the only common connection I can make.

Jun 28, 2009 | 1999 GMC Yukon Denali

2 Answers

2004 Yukon Denali


EITHER YOU HAVE A CLOSED VENT, OR THE HEATER MOTOR FROM THE FROM IS SHOT.

YOU CAN FIND YOUR FREE ONLINE REPAIR MANUAL AT
http://www.autozone.com/N,316250/initialAction,repairGuide/shopping/repairGuideVehicleSelect3.htm

Jan 30, 2009 | 2005 GMC Yukon Denali

1 Answer

No heat,ch.thermostat,water is circulating,blower goin strong .


Check the 'heater control valve'. This valve opens when u turn on the heat switch on the dash, so the hot coolant will flow thru the heater core and provide heat. So although the coolant is circulating in the engine, the valve controlling the flow to the heater core is stuck closed, or not working.

Nov 15, 2008 | 2000 Ford Focus

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