Quote:
Originally Posted by eagle
The water pump cannot pump more coolant out to the top tank than it pulls from the bottom of the radiator. Go to youtube and search: ford model a cooling system explained jack bahm
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Imagine an engine running a little hot, say 185. Maybe there's a hot spot in a little shielded corner running 200 degrees. You punch the gas and the pump spins up. The flow makes the pressure highest at the exit of the pump and lowest at the entrance to the pump and in-between pressure in between. All you need is for the pressure to drop in the block by enough to boil 200 degree water and you'll pull a steam bubble in the block. Then the top tank will fill by the same size as the steam bubble. Too much , and it overflows. So yes, the pump can push more out than it draws from the radiator. It draws from the block.