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Takes a long time to heat my 1998 yukon

I have a 1998 gmc yukon and my heat is not hot but warm and it takes a long time to heat my suv do i need to flush out my heater core if so how?

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  • yukon4x4slt9 Dec 20, 2008

    i have already checked that



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

Posted on Dec 20, 2008


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My 2001 gmc yukon a/c blowing hot air through the vents and defroster and rear a/c starts cool then gets warm

Low on refrigerant , A/C compressor , rear expansion valve . You best bet is take it to a qualified repair shop

Jul 22, 2016 | 2001 GMC Yukon

1 Answer

The heater on my 1998 Yukon does not work unless I rev the engine up or I drive it. When I come to a stop light it will quit blowing hot air.

Sounds like the cooling system is low and has air pockets. The rear system problem could be something electrical.

Jan 07, 2014 | 1998 GMC Yukon

1 Answer


Rear heat not working ? The blower motor isn't working ? No air coming from the rear vent's ? Is it just a yukon or XL or denali ? What size engine ? 4.8 , 5.3 or 6.0 l Manual or automatic climate control ? Does the blower motor work on any speed ? The front an rear heater system are seperate , have there own electrical circuits . Could have a couple of different systems ,could have a control processor or relay's an a resistor block . Do you know how to test automotive electrical circuit's using a wiring diagram and a DVOM - digital volt ohm meter ? Plus to get at the rear heater-A/C unit you would need to take the right rear trim panel off .
2003 Tahoe No Rear Heat Fix Suburban Yukon XL Repair

Dec 08, 2017 | 2005 GMC Yukon

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

Lack of heat 2002 silerado 1500hd. Coolant is full ,Have changed the thermastat. Door under dash seems to work directing flow. Engine temp normal. Air is warm enough to defrost but never warms cabin...

you need to check the blend door motor. it may be getting stuck halfway so its letting the cold air mix with the hot air thus making it not as hot. Its a common problem on these GMC trucks and SUVS.

Dec 22, 2010 | 2001 Chevrolet Silverado 1500

1 Answer

I have a 1998 jimmy gmc 4x4 suv. i replaced the

check blend door actuator behind glove compartment it keeps your compressor from coming on.check to see if the compressor is coming on when you turn the air on.

Jun 07, 2010 | 1998 GMC Jimmy

1 Answer

I need to know where is the #1 spark plug on a 1998 gmc yukon

V8 engine? That would be drivers side front. Remember that TDC is number one piston up (On the compression stroke, not exhaust stroke), timing marks at zero.

Jun 05, 2010 | 1998 GMC Yukon

1 Answer

On my wifes 2004 yukon, the engine warms up and the blower works fine, but it takes forever for the air to finally blow warmly. when it finally does, if we switch it to another location (floor or defrost),...

iwould check the selector motor,and also replace the thermostant,start with the stant first,the selector motor is what runs the door for hot or cold the motor is a common problem,if the temp gauge is showing a quick warm up temp then its the selector motor, if it takes a while to reach operating temp then replace the t-stant,also make sure the coolant is full in radiator,check when cold or warm,dont open when hot, hope this is helpful.

Jan 03, 2010 | 2004 GMC Yukon

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