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


Note: on the crossover pipe, the arrow go both ways; flow is from the right bank to left when T-stat closed, and reverses to go left to right when T-stat opens.

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