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WHN · 08-18-2018, 11:46 AM

The syphon cooling system in a Model A is working whether the car is running or not. What is not working is the water pump and radiator fan. Syphon moves about 35 to 36 GPM. Water pump is really only any help at higher speeds.

Are you using a thermostat?

Are you using a temperature gauge or portable temperature gun?

Out flow at the very top of engine, above water pump, should have the warmest coolant. Inflow at bottom of engine/radiator normally would be about 20 degrees cooler than coolant at the out flow, top of engine.

If your temperature readings are correct, I would be concerned about some kind of obstruction that could be restricting the syphon effect.

08-18-2018, 11:46 AM	#2
WHN Senior Member Join Date: Mar 2017 Location: Connecticut Shoreline Posts: 1,824	Re: Temperature Rises after shutdown The syphon cooling system in a Model A is working whether the car is running or not. What is not working is the water pump and radiator fan. Syphon moves about 35 to 36 GPM. Water pump is really only any help at higher speeds. Are you using a thermostat? Are you using a temperature gauge or portable temperature gun? Out flow at the very top of engine, above water pump, should have the warmest coolant. Inflow at bottom of engine/radiator normally would be about 20 degrees cooler than coolant at the out flow, top of engine. If your temperature readings are correct, I would be concerned about some kind of obstruction that could be restricting the syphon effect.