overheating 1990 535i

[deborah conner]

i have replace thermostat,coolant temp sensor,coolant temperature sending unit,hoses and radiator cap and it still is leaking an overheating and i can't tell where its leaking from

[E38740iMD]

Leaking from back or front of engine

[S61Dan]

Was the water pump ever changed? How about the radiator?

[ZenitramNaes]

Do you still have the mechanical fan? It would be worth test the fan clutch.

[ZUUD BYE]

In my overheating experience it either or a combination of
Thermostat
Fan Clutch
Water Pump
Aux Fan
[radiator blocked with corrosion - rare'ish]

Once you get the leaking fixed, either a hose, radiator expansion tank seal, coolant lever sensor seal or radiator plastic to aluminum seam split under pressure.