Question about 2002 GMC Yukon Denali

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My 2005 Youkon Denali is overheating, at least that is what the gauges and information center is telling me. The coolant level was normal so I assumed it was the thermostat. It cooled over night and when I was moving it the next day I could hear a noise that sounded like it was coming from the water pump, so I changed the water pump and thermostat and it still runs hot. Just in case I bought a bad thermostat, I took it out and tried running it with no thermostat and the problem persisted. What next?

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6 Suggested Answers

frcs68
  • 1605 Answers

SOURCE: temp gauge intermittently indicates overheating

replace the temperture sensor.

Posted on Oct 15, 2008


lancer721
  • 229 Answers

SOURCE: My 1996 ford windstar temperature gauge shows overheating

Your heater core more than likely needs to be replaced unfortunately. If the engine is heating properly and there are no freeze plugs that have been popped then that is your most likely problem.

Posted on Jan 07, 2009

  • 90 Answers

SOURCE: 2005 GMC Sierra Overheating

If your sure there is no trapped air in system after refill and air bleed off, is fan clutch pulling good air thru radiator? Even if it is, the heater should have coolant as hot as what temp gage is showing! Try backwards flushing heater core (dex cool is notorious for plugging these up). There is a TSB for cracked cylinder heads from GM for unexplained coolant loss.Remove drivers side valve cover, and look at center three head bolts for coolant around them, if coolant has been getting in thru this suspect area, there will be a milky/pudding like goo under valve cover and on head. GM had a company called Castec cast these and the areas near the head bolts were found to be too porous (NO recall YET!) Ya, you guessed it, replace heads! Unfortunately, if its gotten hot to many times, it has probably hurt the heads/gaskets. Hope this helps. PS: The castec logo is under the rearmost pair of rocker arms,may have to remove them to see.

Posted on Feb 05, 2009

  • 79 Answers

SOURCE: 1999 GMC Jimmy Running Hot w/ Engine coolant reservoir empty

Hi
The problem is most likely 90% head gaskets but could be intake manifold gasket leaking too. Intake gasket has to be checked when intake is removed. Might find problem there if not continue and remove heads. Bars Leak will not work.

Posted on Apr 03, 2009

mcgyver468
  • 710 Answers

SOURCE: 2001 Honda civic overheating. Coolant level ok.

UNDER THE HOOD IN A RECTANGULAR SHAPED BLACK BOX. UNDER THE COVER IS THE DIAGRAM FOR THE FUSES AND RELAYS. HOPE THIS HELPS. KEEP ME POSTED PLEASE. BEST OF LUCK. THANKS FOR USING FIX-YA

Posted on Apr 30, 2009

  • 13 Answers

SOURCE: engine coolant gauge runs high, but coolant and

bad coolant temp sender

Posted on Jun 22, 2009

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This probably has nothing to do with the gauge fluctuations. The gauge problem is probably one of three possibilities:

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1 Answer

2005 yukon denali is overheating


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