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Originally Posted by jjscerbo
Seems to me that what you have is a low circulation proble at idle. You may want to play around with pulleys to speed up the water pump.
Something else to concider, You may have some combustion pressures entering the cooling system. The pressures may interfere with circulation. Either look for bubbles in the radiator neck while idleing or attach a radiator pressure gauge to monitor rapid pressure increases. Could be due to an overlooked crack in the cylinder wall or combustion chamber.
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yes this is one thing I forgot to mention .. and a good point .. you can have the coolant tested for hydro carbons to see if you have a head leak .. I have see guys going trough what you have chasing this gost ... only to find that problem later ..good advice .