I have a 1999 E46 318i. The car boiled over & almost ran out of water. Found that when I switch the air con on, the temp rise very high & boil over.
No water in oil or in the exhaust. I drive the car every day (with out air con) with no water loose. The temp stays normal in town or open road. The fan does not switch to high speed. Suspect control card on fan or am I missing something. Please help.