Question about 2000 GMC Jimmy

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2000 GMC Heater Problem

My 2000 GMC heater will not heat the car.  I had the radiator flushed and new fluids put in this week but still no heat.  Is this a common problems?

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I had problems with a similar truck,a 1998 GMC diesel after checking to make sure the control cables were operating the blend door and blowing the mess of the heater core,I replace the thermostats.Still no heat turns out there was a small amount of debris collecting in the fitting for the inlet hose at the thermostat housing after removing it and blowing out the lines the heat was fine.

Posted on Dec 05, 2008

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Try removing the heater hoses from the waterpump and the intake mainfold. Then use a compressor to blow out the gunk in the heater core (place the air hose into the the hose you took off the water pump). This worked for my 2001 jimmy.

Posted on Nov 21, 2008

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1997 GMC heater just quit the thermostate seems fine. plows air but no heat?

Posted on Apr 11, 2010

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1 Answer

I can't get heat in the cab, 2000 GMC Jimmy S15


well either your heater core lines are clogged ore the heater core is just bad

Jan 30, 2013 | 2000 GMC Jimmy

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Put a new radiator on 3 days ago...transmission fluid is in the anti-freeze..


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Hi, First check fuses. second, replace thermostat in engine cooling system. Third, If heater fails to produce any heat Flush out heater system and put new 50/50 mix of (ethlineglyco) radiator fluids.
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Jun 12, 2011 | Buick Park Avenue Cars & Trucks

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Heater does not come on, Radiator fluid full. Fluid heats, heater does not work blower works heater does not get hot or even warm.


Probably air locked. check to see if one of the hoses leading into heater is hot. Other cause could be heater solenoid control valve faulty. Very unlikely that the heater matrix is blocked. Easiest way to bleed heater is to remove hose's when car is cold and GENTLY flush through with garden hose and push hoses back on when full of water, so you know you have a heater full of fluid. Hope this helps

Jan 11, 2011 | 2000 Jaguar S-Type

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The heater only blows cold air,the radiator is full,thermastat is working and the engine temp is within normal ranges.


I've had this problem. 2000 GMC uses a closed coolant system. Meaning takes and returns coolant from and to the Reserve Bottle and has little air in the engine and heater systems.
If everything appears ok but no heat. "Air Lock" is the most likely cause. (With interior heater set to full heat) Solution; 1. Make sure water pump works. 2. Drain about 1/2 engine coolant into container. 3 Remove both heater hoses from engine side and flush heater core in both directs through heater hoses with garden hose. 4. Reattach heater hoses in correct locations. 4. Refill engine with coolant. 5 Start engine and run for 2 min., use caution when topping up coolant.
6. Most 2000 GMC have twist off caps with plugs located mid way on heater hoses. with engine cold, start engine these caps may be loosened to allow trapped air to escape. Do not attempt with engine hot due to hot coolant injuries. This may take more than one attempt to remove all air from heat system. 7. Lastly most 2000 GMC water pumps have a bleeder plug,( 3/8" square driver plug) located on the water pump. With egine cold this plug should be removed to remove any air. Reinstall plug with thread sealant.
Hope this helps cheers

Dec 09, 2010 | 2000 GMC Jimmy

1 Answer

No heating on jimmy....fans blows cold air only....heater core is fine


Mine did the same thing you need to have heater core flushed out. Dexcool coolant clogs it up get it and the radiator back flushed and changed to regular coolant. This should fix the problem.

Oct 17, 2010 | 2000 GMC Jimmy

2 Answers

I have a 2000 Chevy Silverado pickup, and the heater will not blow hot air. I replaced the thermostat, and nothing changed. The radiator was flushed and filled in the last two months as well. I have all...


once truck is warm check both heater core hoses to make sure they are both warm if not then check the cold water valve could be stuck shut not allowing coolant to travel in to heater core.

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Heater not working


if you got heat when its running and almost nothing iddling the heater core inside the car has rectriction idle circulation not enough prestone pass thrue the radiator because of scale when our driving way more circulation more prestone go thrue ¸=more heat you need to flush the radiator inside the car normally i put a radiator flush leave it running longer then what they say go for a drive remove the heater core hose be carefull not to break the pipe use garden hose pass hose water pressure o n both side do it a few time each side flush all the prestone add new prestone you shoul have way more heat good luck p.s some shop might tell you change the heater core that perfect but very big money do it right its cheap and gonna work pierre

Jan 14, 2009 | 2000 Dodge Caravan

1 Answer

No heat comming out of fan


These are well known for clogged Heater Cores. I would have the heater core flushed if possible.

Sep 13, 2008 | 2000 GMC Jimmy

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