Quote:
Originally Posted by BMWfan73
Do you know the normal coolant operating range for the 35i? I have an Ultragauge device that plugs into the OBD2 port and I can set an alarm for things like coolant temp when it falls below or rises above a certain temp.
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Coolant should run in range of 100C ~ 110C or so. You can use the car's 'hidden menu' function on the OBC if you want to spot check coolant temp (and several other parameters, such as system voltage). Video here
There might be better video's on YouTube - when you enter the hidden menu you need to first 'unlock' it using a numeric entry, which is sum of the last 5 digits of your car's VIN number, before you can access it's menu- this function has been available on BMW's for a long time, you may have used it on your prior 3-Series car (?). Once in hidden menu mode the OBC readout will stay there until you either exit that mode or turn off the ignition.