Reply To: V-12 Cooling

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check to see if the radiator ‘vanes’ are actually attached to the tubes. These come free sometimes, or were never connected.

Are your return hoses collapsing. Have you run a real flow test on the system. Sure you don’t have a head gasket leak, or a crack in the heads or block. Temperature should be 165-175 degrees. Could you have an inline thermostat in the top hoses, and one or the other are frozen closed or highly restricted. Could your water pump be sucking air into the system causing cavitation in the lines. The cooling system is often a problem for Pierce owners. Sooner or later we all have to go on a ‘search and destroy’ mission and clean-up the whole system. Restoration Supply sell a closed system coolent that is basically straight antifreeze with rust inhibitors, with NO water added. This gives a slight edge. I am running 165 degrees at idle with it. Yes some have added a shroud, but the placement is very important, as the fan can give LESS flow if not set correctly. Good luck, I’m not a mechanic!!