My '05 Yukon started getting hot when driving 40+ mph. When at idle it cools back down. Its below freezing here so this is confusing. Coolant level is fine and no leaks. Heater is also working. Any help on where to start is appreciated.
2005 Yukon Overheating
- Thread starter jason309
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Sounds like you have a flow problem at the radiator. The coolant needs to carry heat from the engine to the radiator, when the thermostat opens, and then be recooled at the radiator fins as the fluid flows through the core of radiator as air moves across. I would not suspect fan clutch because typically you don't need a fan at highway speeds with all that air moving across the radiator. If at just 40 mph then the fan clutch should be working so make sure you check it also.
I do have e fans I replaced the water pump a little over a year ago and have had no issues until now. Whats the best way to back flush the system? Ive also heard of the possibility of the impeller slipping on the water pump, causing not enough flow at higher rpms
Could be impeller but then it makes no sense that at idle the temp is ok.
Typically a back flush is maintenance and not a repair. It can't hurt and will likely do some good but likely not fix the problem, just band aid it. Forgot about the fans. You should have a sensor that turns them on and off but even if not working at higher speed the air flow alone is typically good enough to cool off the coolant in the radiator. Blockage is my guess and I am sticking to it. If you have a laser temp gun you can point at the radiator at several spots and see if there are wide ranges in temp.
Typically a back flush is maintenance and not a repair. It can't hurt and will likely do some good but likely not fix the problem, just band aid it. Forgot about the fans. You should have a sensor that turns them on and off but even if not working at higher speed the air flow alone is typically good enough to cool off the coolant in the radiator. Blockage is my guess and I am sticking to it. If you have a laser temp gun you can point at the radiator at several spots and see if there are wide ranges in temp.
I've had good luck on older vehicles with removing the t-stat, disconnecting the upper and lower hoses at the radiator and running a garden hose where the t-stat goes. For the radiator, I'd pull it out, flip it upside down and run a hose in where the bottom hose goes.
SLCHOE
ASE Master Certified + (L1)
Is it actually overheating at high rpm? Is it boiling? I guess you need to clarify "getting hot" first and foremost.
If it's not boiling over, I'd check the ECT first and rule that out of the equation.
Gabby burks
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So i have a 05 yukon and it over heats a lil over half but doesn'tt go anymore than that. It will go down a lil but then go back to a lil more than half. Could anyone help me out with that?
SnowDrifter
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Gabby burks
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Okay im new to this so how do i do thatI'll be more than happy to help you
After you start a new thread
