Just purchased a used BMW 91 735i. Immediately changed the heater core because of overheating problems. The car ran fine for almost exactly 1 week. Checked the coolant level and needed to add 1 gallon of antifreeze after week 1. Six days later, the same thing. Eventually, each time the car is running for period of time, coolant has to be added. There are no visible leaks, no white smoke from the tailpipe. The mechanic did not find any traces of oil in the coolant or visa-versa. Both the radiator and the water pump seem to have been changed in the last few years, but I have not been able to test either of them to ensure that they are functioning properly. The clutch on the fan does not move freely once it has heated up, so I assume that means it is working as it should. I just changed the heater control valve because it looked a little rusty. I am trying to check off all possibilities before attempting a head gasket change. Can someone please help? Perhaps the problem is right in front of my face and I just don't see it???
- posted
18 years ago