The hot weather isn't even here yet!
If the fan clutch is good and the system was bled properly you have something else going on. Spending good money to upgrade something that is not be broken may not solve the problem that you are having. When was the Waterpump and electronic thermostat replaced? The original BMW waterpumps have an impellar that is made of plastic and has been known to slip on the metal shaft when they get old.
'99 E39 540iT
Last edited by MLue1; 06-08-2009 at 01:22 AM.