Quote:
Originally Posted by Tom Wells
Mike,
I have a catch can attached to the radiator overflow.
When the engine is hot, the water expands, driving some of the air out through the tube. The air comes out because the overflow is attached nearly at the top of the radiator where the air can accumulate.
As the engine cools, water is sucked back in from the overflow can, so it is vital to keep its water level above the end of the tube.
Tom
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I have a question about this. If the overflow tube is above the radiator cap, I can see how excess coolant will overcome the cap pressure and be vented to the catch can. I cannot see how coolant can be sucked back into the radiator from the catch can, because the (pressure) radiator cap is closed.
What am I missing?