BMW X3 E83 engine temperature and cooling
Why does the BMW X3 E83 not warm up or the temperature swing?
The most common cause is the main thermostat. Its plastic retaining tab can break, so the thermostat does not stay tightly in place and the temperature gauge stays in the blue. The cause of the temperature swings has sometimes been found only after several thermostat replacements. Over 85 °C is normal on the highway.
Why does the X3 E83 temperature rise in city driving?
The cooling fan may not be turning. The fan and its control unit are one part, and both can fail. The fault codes then come from the fan. Replacement fixes the fault.
How do you bleed the cooling system with an electric water pump?
On the 3.0d: 1. Turn the ignition on without starting the engine. 2. Set the fan to minimum and the heat to full. 3. Press the accelerator to the floor for 10 seconds. 4. The pump runs for about 12 minutes. Add coolant as needed. Bleeding is also needed after replacing the heat exchanger.