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Why does the engine overheat while idling?
1993 Chevrolet Suburban 2500

Why does the engine overheat while idling?

(1993 Chevrolet K2500 Suburban)
When driving over 35 mph the engine temperature seems to be fine. Once I come to a complete stop the temperature starts going up. Once the temperature gauge needle reaches the half point the fan noise gets very loud when I accelerate & the truck looses a lot of power. Slowly the needle starts creeping higher and higher until I start driving over 35mph again. There are no leaks. Coolant level is at its normal level. I also checked the radiator cap & looks fine. The thermostat seems to be working as well. Also there is no white smoke coming out of the exhaust pipe. The Suburban has 45,000 original miles on it. Please help thanks
1 answer & 2 comments
Popular Answer
on October 24, 2014
Start by replacing the thermostat!.. By what you stated about the fan noise.. Seems the fan clutch is working and that's what takes over when sitting in traffic!..At hi way speed, don't need a fan!..Put a new stat in and see if it helps..That's the FIRST thing to do when an overheating problem arises, then go from there.
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on October 24, 2014
Thank you! I'll replace it & let you know if it worked.
on October 24, 2014
Coolant Leak Diagnosis
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on October 24, 2014
Start by replacing the thermostat!.. By what you stated about the fan noise.. Seems the fan clutch is working and that's what takes over when sitting in traffic!..At hi way speed, don't need a fan!..Put a new stat in and see if it helps..That's the FIRST thing to do when an overheating problem arises, then go from there.
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on October 24, 2014
Thank you! I'll replace it & let you know if it worked.
on October 24, 2014

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