Hey all! I bought a 1997 740i a few weeks ago and absolutely love the thing. The other day I decided to hook my OBD reader to the car. Everything looked fine except the coolant temperature. The gauge on the dash says everything is fine and is right down the center. The OBD says it is running between 230 to 235 F. That seems very warm in my opinion. I have an XJ8 with an engine that is similar in design to the M62 that only heats up to 198 F on the hottest of days.
I have tried bleeding the system, which did help the heater out quite a bit, but it still stays right at 230 F. It does not matter if I'm idling, on the freeway, or putting it under load. Outside temperature does not seem to affect it either (mornings are 40F afternoons are 70ish). The fan clutch is kicking on and off as it should. The top and bottom radiator hoses are both hot, with the top one being the hottest. Everything seems normal... except the indicated temperature. Could it be the sensor? I haven't gotten that far yet... But any advice is appreciated, and thanks in advance!
Last edited by BMScott; 10-25-2013 at 10:26 AM.