Question about 2005 GMC Yukon Denali
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
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
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
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
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