🤦🏻♂️ No, the radiator cap regulates the pressure. As coolant gets hot it expands, raising the pressure. If too much pressure builds up the cap opens to decrease pressure and allow coolant to flow into the overflow reservoir.
It is an expansion tank, not an overflow hose on your boiler. This happens every time engine gets up to operating temperature. Coolant is not compressible, but expands a lot. If you look into expansion tank you can see how level fluctuate between hot and cold.
🤦🏻♂️ No, the radiator cap regulates the pressure. As coolant gets hot it expands, raising the pressure. If too much pressure builds up the cap opens to decrease pressure and allow coolant to flow into the overflow reservoir.
Exactly, when pressure surpasses the caps rating it will vent excess pressure which doesn’t happen often.
It is an expansion tank, not an overflow hose on your boiler. This happens every time engine gets up to operating temperature. Coolant is not compressible, but expands a lot. If you look into expansion tank you can see how level fluctuate between hot and cold.