2005 Chevrolet Tahoe Q&A
2005 Chevrolet Tahoe Question: Heater doesn't work.Engine overheats at higher rpm but drops back down at idle.
Sounds like you have a bad thermostat. Is there no heat at all times? Feel your radiator hoses one should be hot and the other should be warm after the veehicle reaches operating temperature. Also check if your cooling fan is turning. I believe you have a clutch fan which means as the vehicle gets hotter the fan turns faster. - gmc4me