quote:Originally posted by Tim H:
,,,it does look like the standard parts diagram on Wilkinson’s site. The big difference from the “OEM” diagram on the sticky is that the upper tube from the overflow tank just empties out under the car. Is that correct? How does the system stay pressurized with an open hose coming out of it?
Tim
In the ORIGINAL configuration (like the Wilkinson diagram), the swirl tank will have a pressure cap where the overflow tank is just a flat cap.
as shown in illustration
Yellow is filling the swirl and the overflow about half full
Red is the car hot. the coolant expands with heat and lifts the swirl's cap lower seal and forces the little bit of air and extra coolant volume into the overflow tank
Blue is the car cooling down. as the coolant contracts it pulls a vacuum and sucks coolant through the inner valve from the overflow tank and now no air is in the main coolant.
