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pal has overheating problem with a 216.you could let the car idle for long time temperature stays right around 175-180 take it down the road car overheats. has replaced everything thermostat, hoses (bottom one with wire)flushed out engine etc. still overheats only thing hasn't replaced is water pump, could there be something internally wrong with the pump. like said idle temp ok but running at say 45-50 mph overheats thanks
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Joined: Sep 2009
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Probably not the pump. Generally the only problem pumps present leaking. Probably the radiator. Or possibly: a. Cracked head or block b. Leaking head gasket Check the radiator first. Fill the radiator up with the bottom hose off. Hold your and over the bottom outlet until full. Quickly remove you hand from the outlet and water should shoot out about 4-6 inches and immediately empty and no sucking sound. If there is only a 1-3 inch hight and it takes a while to empty and some sucking sounds from the top, then you know the some flues are stopped up or some degree of being plugged. Thus the cause of the problem. You can back/reverse flush for temporary help but the radiator probably needs rodding. Or a replacement radiator or core. Good luck, Charlie 
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Here is some food for thought created by doing an Advanced Search of our past posts. I used the word OVERHEATING. gOOD LUCK, mIKE Radiator problems Crude in my head
Mike 41 Chevy
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The description of the overheating problem is consistent with exhaust getting into the coolant. Auto parts stores have a test kit to detect exhaust gas (CO2) in the cooling system. I would recommend that be used before other more drastic action is taken.
How Sweet the roar of a Chevy four!
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Tech Advisor ChatMaster - 25,000
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The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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If it takes a while to overheat when driving at higher speeds then it would tend to be radiator. If it overheats quickly at road speed then more likely head gasket like Chipper said.
Dens Chevys 1927 Speedster 1928 coupe 1941street rod 1947Fleetline 4 door 1949 1/2 ton Pickup (sold) 1954 210 4 door 1972 Monte Carlo 2003 Corvette convt..
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head gasket has been replaced
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Was the head gasket replace because it was leaking? When the head was off was the mating surface checked to make sure it was flat and was the head magnafluxed for cracks?
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