My '68 Camaro has still been running hot, has a 383 stroker engine (the one
a hairline crack that I wrote about on an earlier post). We've been trying
out why it has been running so hot, and if that may have caused the crack.
I switched to a 160 degree thermostat (from 180), still runs hot.
After driving a few miles, the upper radiator hose is hot, but the lower
hose is only
a little warm-- could this mean the problem might be in the radiator itself?
Sounds like the water pump!
Heat rises, so it will exit the thermostat housing, and the water pump pulls
from the lower radiator hose.
The impeller might be loose or might have fallen off the shaft on the water
pump. You can remove the back cover on the water pump, and the back gasket
comes with some timing cover kits. (The off brands)
But, it could be a blockage in the radiator, from using too much stop leak.
It is a crossflow radiator.
Did the car start overheating after the new radiator was installed? If it
was recently filled, you may have air in the system. This could also keep
the coolant form circulating. If your thermostat does not have one, drill a
small hole in it to allow the air to get out.
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