I managed to find time past weekend to look at the p38 a little more in depth. I was hoping to be able to pinpoint the exact cause of the problem head gasket or something else.
To make sure I didn't suck in air somewhere due to a faulty radiator or hose I went ahead and replaced the radiator, the bypass hose at the back of the engine and the hose between thermostat and heater core. I also replaced the thermostat o-ring and waterpump at the same time. The radiator I was going to replace anyways, I bought an aluminium one which is a bit thicker and therefore has more cooling capacity.
Link to Direnza: P38 dse radiator Direnza
I ran a quick pressure test and after minutes I lose 2,5 psi starting from 15psi, which I think is still problematic.
I investigated all hoses and connection while under pressure to find leaks of coolant but I couldn't find any external leaks. I checked at the heater core as well, but since that radiator has been replaced as well and also has newisch o-ring it was unlikely to find a leak there.
So that basically means I'll have to strip the head off and replace it.
More on this soon.👊
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