I was thinking about finding a Chevy board and asking this, but I know you guys are the smartest entity of car enthusiasts on the internet, so I'm hoping you'll help me out even though it is a bowtie.
My dad and I recently rebuilt the motor in his 92 Chevy Pickup (350v8) and put it all back to stock except a mild towing cam, since we use this truck to pull. Well, we've got a problem.
It heats all the way up to 250° before the Thermostat opens and then it rockets down to 180° and runs forever just like a champ. Even when the gauge reads 230°, the top radiator hose has no fluid in it and isn't hot. Then all of a sudden when the gauge shoots down the hose becomes hot and fills up.
This is the third thermostat we've tried, and they've all done the same thing. Different brands, everything. I dont think the thermostat is at fault. I've ran the thing for about 100 miles with the heater wide open trying to work any air pockets out of the cooling system, but it doesn't help. What else could it be?
Thanks guys!
My dad and I recently rebuilt the motor in his 92 Chevy Pickup (350v8) and put it all back to stock except a mild towing cam, since we use this truck to pull. Well, we've got a problem.
It heats all the way up to 250° before the Thermostat opens and then it rockets down to 180° and runs forever just like a champ. Even when the gauge reads 230°, the top radiator hose has no fluid in it and isn't hot. Then all of a sudden when the gauge shoots down the hose becomes hot and fills up.
This is the third thermostat we've tried, and they've all done the same thing. Different brands, everything. I dont think the thermostat is at fault. I've ran the thing for about 100 miles with the heater wide open trying to work any air pockets out of the cooling system, but it doesn't help. What else could it be?
Thanks guys!