So I’ve had my share problems with coolant problems. Can’t remember exactly what I did few years ago but I changed one of the heat exchangers or side (small) radiators to a CSF rad cause the old stock one had a hole in it and did a complete coolant flush, took it to MB n they pressure serviced it. I believe I also changed out both sides pumps. Coolant temp would run perfect and never go above 200 it seemed. As of lately coolant temp starts to run to about 219 and slowly come back around to 200 and fluctuate up and down there. The super loud fan is on when I’m done driving now. I guess the question is do I take it back and have it pressure serviced or do I change out the pumps and the other side side rad?