My 1990 chevy 350 keeps over heating, i have plenty of coolant and a brand new

H

Hickman09'

New member
therm. is it the waterpump? My 1990 chevy 350 keeps overheating and it has plenty of coolant and a brand new thermostat, ive checked all the lines and everywhere and cant find any leaks...could it be the waterpump going out???
 
it mostlikly is a dirty radiator. the water pump has a warning type seal that will leak or it will just go out. clean the radiator or get a new one. that should be it
 
It may be that your thernostatic fan clutch has leaked dry and is no longer functioning properly.
Radiator could be partially clogged.
Also, pull the new 'stat and toss it in a pan of 200 degree water and see if it opens. I have gotten bad ones before.
The water pump impeller could be spinning on the shaft, but I doubt it. If it's not leaking or making noise, it probably isn't bad.
Finally, if it only overheats at highway speeds, squeeze the lower radiator hose and see if the reinforcing spring that holds it open has rusted away. If it has, your hose may be collapsing above 1500 rpm and cutting off water flow..
Take off the radiator cap and if you see lots of bubbles in the filler neck(with the engine running), you may have a blown head gasket.
 
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