Re: “Normal” model a temp
The Model A cooling system was advertised as being a combination water pump and thermosyphon system. The thermosyphon pumping is driven by hot coolant in the engine so it won't pump until the coolant gets hot. So it works like a thermostat. On my Model T this worked very well to keep the engine at about 180 F. There is no water pump on a stock Model T. On a Model A I am not sure how much the water pump contributes to the coolant circulation but probably more than half.
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