Normally, this goes to the heater matrix. As I don't have a heater any more, and I changed my coolant system, I thought I could just blank of off, forcing more coolant through the main system, increasing coolant capacity. I had it looped before.
Yesterday, my blanking cap blew off because of pressure I suppose. My question is, can you even blank this off, or does it always need a bit of flow, or a way to reduce pressure here?
It is the start of number 7 in The drawing below.