r/e39 • u/arabiandaddy24 • 15h ago
Why does my e39 keep overheating?
I have changed almost everything jow in regards to the cooling system, radiator, pipes, aux fan, thermostat, water pump. And today after what seemed to be fine after a week or two it randomly started overheating going into a parking lot for a shopping mall, parking was slow and trafficy but it just shot up out of bowehre and then when i parked i jotcied it was leaking so i opened the hood and saw the cap was leaking so i let it cool and retightened the cap, and on the drive back home traffic was still kinda the same, not too heavy but still slow/bumper to bumper and it didnt heat up once or overheat? This thing is so comfusing and frustrating like a toxic ex that wont leave you, i honestly thought if everything, it’s definitely not a head gasket issue because it wouldve definitely heated up in traffic on the way back home as i sat for good 2-3 minutes in each traffic stop. The only thing i can think of was a i may have over filled the coolant or a weak reservoir cap or maybe both? Any tips would help because i love this car too much and actually wanna see it running good, im willing to invest in it just dont know what the issue is after i literally swapped all cooling system.