Question about 1998 GMC Yukon

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My 1998 gmc yukon is running hot. I dont know why. The other day i had a new thermostat put in just because it wasnt heating up on the inside of the truck. Could the thermostat be the problem? Would it take a couple of days if it is the thermostat? Within the last year, i've had water pump and radiator replace. What could be my problem?

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Most likely problem is that the cooling system has air trapped in it, if you can find someone with an AIRLIFT tool to bleed the system

Posted on Dec 09, 2009


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1 Answer

2005 gmc yukon denali xl engine fans dont come on

under the hood I would check the thermostat to make sure it open so that the hot antifreeze reaches the sensor to make the fan start

May 03, 2014 | 2005 GMC Yukon Xl Denali

1 Answer

I Have a 2003 Yukon denali & I dont get no heat i change the thermostat & antifreeze but no heat

1) Check your water pump is working OK and
2) You may have an airlock in the system. Take the expansion or header tank cap off, set your heater control for hot and exterior air. Start the car and run it till warm. With luck you'll run any air locks out of the system. While warming up, and being very, very careful, try squeezing the main radiator in and out tubes (The fattest) this may also move any air locks on. BUT BE CAREFUL, STAY AWAY FROM AND FANS AND PULLEYS. IF NOT SURE, DON'T DO IT OR STOP THE ENGINE FIRST.

With luck, you should soon start to feel warm air coming from the vents.

Mar 29, 2011 | 2003 GMC Yukon Denali

1 Answer

My 1996 GMC Yukon does not have any heat, just blows cold air what could it be

Check coolant level. if ok then see if engine comes up to temp. 190+ at thrmostat housing. If not, replace thermostat. If thermostat is ok, feeel heater hoses. If one is hot , and the other cold, then remove both and flush heater core. If both are hot, suspect blend door problem in heater box. probably need pro help for that.

Dec 18, 2010 | 1996 GMC Yukon

1 Answer

How do you find and fill the radiator in 2003 GMC Yukon XL

Some of these vehicles have a false petcock. Pop off the lower hose over a catch pan, pour a gallon of water in the plastic Dexcool Coolant bottle and put the hose back on when it stops pouring out. Fill to the max line and run the car until both radiator hoses are hot (thermostat has opened). Replenish fluid to max line and cap the bottle. If you have electric fans make sure they come on and make sure your temp. gauge stays in the middle. It'll take longer on cooler days. You might have to get in the car and gas it to about 2000 rpms. Don't cap the bottle until the thermostat opens. If it vomits, change the thermostat and again make sure the electric fans kick on or the clutch fan speeds up at about 210 degrees.

Sep 04, 2010 | 2003 GMC Yukon XL

1 Answer

Thermostat for 2001 GMC Yukon XL

Not true,Although,it is located in the pump,You don't need to replace the pump if the thermostat is replace.See pix

Jan 08, 2009 | 2001 GMC Yukon

1 Answer

Takes a long time to heat my 1998 yukon

Check engine coolant thermostat to see it's not stuck open.

Dec 20, 2008 | 1998 Acura TL

1 Answer

99 yukon temp gauge never warms up past 150-160. runs cold

First test your coolant with a thermometer when it gets to full hot. Don't get scalded with the hot fluid.
if it is hot enough maybe the water temperature sensor is faulty. If the sensor is good then try putting the thermostat in a pot of water and with a thermometer test when it opens. sometimes even a new one is not accurate.
To test your rear window defroster,check your fuse, if good follow the circuit with a voltmeter. Wireing diagrams are in the Haynes manual.

Dec 06, 2008 | 1999 GMC Yukon

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