CHEVY OVERHEATING ON FREEWAY

1992 Chevrolet Silverado

Tiny

softaieddel

February, 17, 2010 AT 1:43 PM

Engine Cooling problem
1992 Chevy Silverado V8 Four Wheel Drive Automatic 150000 miles

I have a 92 chevy truck with a 5.7, I use it for snow plowing and have for years. But it overheats on the freeway and is getting worse. I have replaced the thermostat with no luck and flushed the radiator and no rust came out and has good flow. When it overheats as soon as I pull off the freeway the temp jumps back down really quick. It does not overheat in town?

FOUND 13549 RELATED QUESTIONS

1 Answer

Tiny

tooomanytoys

February, 17, 2010 AT 1:51 PM

Have you checked all the shrouds. Even the bottom skid plate acts as way of directing air across radiator, and cause overheating if not installed. I would then check the cooling fan clutch to make sure its not freewheeling when warm. If that test ok I would next check water pump. Sometimes the impellor fins break causing the vehicle to not circulate coolant good at higher speeds.

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