Question about 2005 GMC Yukon Denali

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2005Danali youkon xl 6.litre...nu water pump n thermastat ,no heater...car over heats.

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  • GMC Master
  • 14,585 Answers

First start with making sure the engine is purged of air, and you have no thick white smoke coming from the exhaust in back. 2 sure signs of a blown head gasket are, thick white smoke. next is , leave the cap off the reservoir/radiator. If it throws the coolant back out at start up, it's bad. Not there, next is to do a compression test on the cylinders. Low or no compression is bad gaskets also. These are the first things to check and do. Before just throwing money at good parts.

Posted on Dec 26, 2016

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Posted on Jan 02, 2017

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SOURCE: 1994 pontiac firebird HAS NO HEAT

Okay. warm up vehicle, get radiator hoses hot.  Turn on heater, fan on low.  Grip both rubber heater hoses close to the firewall, from the engine compartment side.  They should be too hot to hold for long.  If they are not hot, then you have a lack of coolant circulation to the heater hoses.  If they are hot then access heater core, behind glove box area.  Blend door which moves as you chose HOT or Cold, should be cable controlled, move the controls and be sure the door is actually moving. Keep me posted 

Posted on Dec 17, 2008

  • 1 Answer

SOURCE: over heating

The brand new water pumps are junk. I put a reman water pump on and it works great.

Posted on Jan 15, 2009

  • 6982 Answers

SOURCE: 2004 jeep cherokee

Yes...and no. and you left out the electric fan, and clutch on primary fan. You need to determine the cause by testing. Unless the water pump is leaking or the bearing on the shaft is loose or noisy, it is not causing overheat. Primary cause of overheats is coolant loss. check everything for any and all leaks. Next, change thermostat. It's cheap and easy to replace plus it becomes unreliable after any overheat. Check electric fan to make sure it comes on when needed, and last, check that radiator is not either externally blocked (leaves etc) or internally blocked with calcium deposits. If you have any white smoke from tailpipe , coolant in engine oil or on spark plugs, you have a blown head gasket.
Hopefully it's something simple!

Posted on Apr 24, 2009

RonPark
  • 855 Answers

SOURCE: no heat, heater core is good,blower moter works

Check the operation of the heater control valve. If it doesn't open up no heat. If the cable moves the control on the valve take the valve off and check it manually. The lever may work but the valve still doesn't open.

Posted on Sep 30, 2009

  • 33 Answers

SOURCE: Heating is not working. We have change the

Lower intake manifold could be gone or heater core plugged.

Posted on Dec 05, 2009

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You mean the car is running fine but just No Heat?
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Hi, My 1989 Toyota camry is leaking coolant and over heating. Also while hot the heater blows cold air.


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2 Answers

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

2 Answers

Cooling system


these are somethings that maybe causing it to over heat (1) not enough cooling in it.(2) water pump drivebelt (3) Radiator core blocked (4) Bad thermostat (5) fan blades broken or cracked (6)Radiator cap need to be replace (7) Ignition timing incorrect if all fails stop by your local library and get your hands on a Haynes auto repair Manual for your car wish you the best of luck Michigan Man

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1 Answer

No heat, heater core is good,blower moter works


Check the operation of the heater control valve. If it doesn't open up no heat. If the cable moves the control on the valve take the valve off and check it manually. The lever may work but the valve still doesn't open.

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It could be the heater control valve under the hood or it could be the heater core is plugged up .

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Over heating


The brand new water pumps are junk. I put a reman water pump on and it works great.

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