New Developments. The plot thickens...

[D_Train]

Originally Posted by jfunez

place an empty container on the coolant reservoir drain hose and drive it like usual....after a long drive check to see if there is coolant in the container...If so..then you most likely have a BHG leaking into a water jacket...{like usual}
this causes high presure in the coolant system pushing the coolant out trhough the reservoir and spilling "only" when the vehicle is driven or at high RPM..

now what is "high" rpm?

[supramacist]

4 to 6k rpm.

just go drive it hard.