Question about 1998 GMC Yukon

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1998 gmc yukon temperature gauage jumping and cold air blows out vent but soon as antifreeze is added it stop jumping and blows hot air is it a heater core problem or a leak.

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Have your cooling system pressure tested to find your leak.

Posted on Feb 04, 2015

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Posted on Jan 02, 2017

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Ronnie Houston

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SOURCE: 2002 GMC Yukon blows cold air from the front, rear works fine

check you antifreeze level and make sure its full

Posted on Jan 26, 2009

Philip Armitage

  • 437 Answers

SOURCE: 2004 Yukon. driver side air conditioner not working

you need to change drivers side temp door actuator then disconnect battery for 5 seconds and reconnect after changing the part, turn key on for 60 seconds with touching heater control to allow actuator to program and then it will work.

Posted on Sep 19, 2009

Anonymous

  • 44 Answers

SOURCE: 2004 GMC Yukon blows hot air out of the driver

Probably the left temp actuator. The wires in the right I/P junction block could have poor tension also, but it's usually the temp actuator.

Posted on Oct 02, 2009

Tech jk

Tech jk

  • 102 Answers

SOURCE: my heater stoped blowing hot air.antifreeze level

If the blower is blowing air just fine, but you cannot control the temperature, you need to listen to air coming from the vents while turning the temperature from hot to cold. If you do n ot hear any change in airflow, then you may a temperature door in the dash broken. this is becoming a common problem on the Equinox and Pontiac Torrent,

Tech JK
-------

Posted on Oct 15, 2009

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No heat just cold air


Is the gauge showing the engine is warming up to normal temp ?
Are the heater hoses getting hot ?
If the heater core is getting hot, it could be a blend door problem. The blend doors direct air thru the heater core and the ac evaporator among other things.

Dec 06, 2012 | 2005 GMC Yukon

1 Answer

2001 gmc yukon.hot air coming out the rear vents only when the ac is on. front vents blow cold.


try cheking the heater hoses located on the fire wall there are two of them if they are hard then they need to be replaced if they are soft then they are good. also chek the heater core

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Coolant system


think it needs more coolant added when engine is cold

Jan 18, 2010 | 2002 Pontiac Grand Prix

1 Answer

04 gmc yukon heater air cold passanger side.


If this happens when you are idle, and then you get hot air as you drive, most likely you have low coolant and it only cycles as you drive. Get approved dextrom gmc coolat and cap off your coolant it is most likely low.

Jan 17, 2010 | 2003 GMC Yukon XL

2 Answers

My heater stoped blowing hot air.antifreeze level


If the blower is blowing air just fine, but you cannot control the temperature, you need to listen to air coming from the vents while turning the temperature from hot to cold. If you do n ot hear any change in airflow, then you may a temperature door in the dash broken. this is becoming a common problem on the Equinox and Pontiac Torrent,

Tech JK
-------

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1 Answer

2004 Yukon. driver side air conditioner not working


you need to change drivers side temp door actuator then disconnect battery for 5 seconds and reconnect after changing the part, turn key on for 60 seconds with touching heater control to allow actuator to program and then it will work.

Sep 19, 2009 | 2004 GMC Yukon

1 Answer

Heater blows cold air from top vents after running for 1.3 hours


Sounds like you may be able to fix it by flushing your antifreeze and back flushing the heater core. Some car owners cheep out and put stop leak into the antifreeze, others dont change there antifreeze at all. Both are mistakes.

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1 Answer

2002 GMC Yukon blows cold air from the front, rear works fine


check you antifreeze level and make sure its full

Jan 26, 2009 | 2002 GMC Yukon XL

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