Thread: run hot on idle

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I've checked the fan clutch and it seems fine. The car does have its fan shroud on it. It almost seems as if, it did not get water when the engine began to idle. Can this be an air issue in the water system? I guess I can let it run on idle, with the radiator uncapped and watch for water movement and air???? thanks - kip

Sometimes you have to burp an engine. Hondas have a bleeder valve on top of the engine for this reason and if you don't do it they overheat.

There are lots of unknowns here. What kind of car, what water pump, what kind of radiator, did the car run hot before the rebuild, etc.

Don

Its a sbc 350, in a 77' corvette, with a 60 over bore, an L82 cam, running off the center carb of a tri carb system, the car did not run hot before, and the shroud is in place. I'm putting the other carbs on now that the center seems to be set, and will run the car at idle, with the radiator uncapped to watch for movement of water and air escaping. I did not let the car run long enough to see if it would have dropped after the 210 was reached... if the radiator seems ok, I'll cap it and let is run to see what happens... thanks - much, kip

Don's right about 210 not being that hot, even 220 is not that hot when properly set up with a 50/50 mix of coolant and water. 245 can be safely obtained before a serious problem erupts. The first thing I would recommend would be to make sure all of the air is out of the system and then run and test it again. An air bubble block can cause overheating problems. But then again 210 is not overly hot.