The Westfalia / Vanagon 2.1L (1986/91) cooling system flow / chart

 

 
UPDATE!!!!!!!! on the left water jaket, the arrows directions is wrong, they should point towards the pump!!!!

Note:
the red section is controlled by the thermostat, when this one is close, the coolant continue to flow through the purple hose. (and coolant is still flowing through this one even if the thermostat is open).
 

Note: Both heaters are not controlled by the thermostat

 

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