Question about Chevrolet 1500

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Truck overheats at high speeds water pump does not leak i replaced every possible part there is

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Have you tried checking the fan clutch. make sure that it is locking up when warm. when engine is warm, turn off engine and watch the fan. it should stop immediately. if it keeps spinning, fan cluth is bad. also feel inside of radiator all around for hot and warm to cool spots. radiator may need rod out...good luck

Posted on Jan 06, 2009

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Posted on Jan 02, 2017

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I v checked the cooling system, no leaks, new water pump, water pipes solid, changed cyl. head gasket, new radiator cap, checked water level, oil level, fan working, water circulating.


no car make or model mentioned so getting an answer is hit and miss
however what you describe indicates a fan drive problem so if it is electric fan cooled-- check the fans for full blade speed ( weak motor operation) or if viscous fan hub ( fan clutch) replace the viscous hub
it is all about moving air through the radiator when the vehicle speed is slow and the engine rpms are high
if the fan is not doing the job of pulling air through the radiator , the car will overheat
at highway speeds the ram action of the air flow virtually makes a fan useless as there is more than enough air passing through the radiator to cool the water
Im guessing here but I suspect that you have a viscous fan hub

Mar 27, 2017 | Cars & Trucks

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if no visual water leak on the radiator n hoses orany water passage..
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Do you have a Summer Thermostat ?
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Steering system


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1 Answer

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