Hello,

I was checking my coolant tubes, the big ones that comes from the radiator to water pump and thermostat housing.

I am getting confused on how the coolant circulates in R53's engine, does the water pump draws coolant away from engine block? I noticed that the radiator heats up first on the passenger side then goes to driver side.

But the upper hose\tube is connected to thermostat housing, looks like coolant is moving away from engine block too?

Thanks.

 

i'd be interested to know this as well. it's a spaghetti bowl of coolant lines

 

My thinking is, from the thermostat when it's open coolant flows out of the engine block via the thermostat, goes to the upper rubber tube to the upper inlet port of the radiator ( on the passenger side ).

Now people are saying... the water pump draws coolant from the engine block too!!! so where is the cooled coolant from radiator goes to?

 

I found this description on AllData: