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Old 07-06-2019, 08:22 PM
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briansansone briansansone is offline
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where does the coolant go?

I have always had questions on exactly how coolant circulates through an engine.

What happens before the thermostat opens?
If the coolant is pulled from the bottom of the radiator, but does not return to the top.... Whats going on. How does the coolant circulate around the engine
before it is allowed back to the radiator by an open thermostat?

I will be bypassing the rear heat on my chevy van, and I realized I dont quite know which way the coolant is moving through the various hoses.

Sounds like a beginners question, but I bet not all working mechanics know exactly the movement of coolant. I have never had a problem fixing anything
with a cooling system. I know the basics. But I realized if I look at any one
hose, like the little line coming out the top of the pump, I dont know what the purpose is , or which way the coolant is moving ( i assume its some type of bypass related to the flow with a closed thermostat. )

All right pros. Whats the deal?
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