What Causes High Water Temperature in BMW 3 Series?

[OAndres]

BMW 3 Series high water temperature reasons are as follows: Excessive engine carbon deposits: When there is too much engine carbon buildup, heat cannot dissipate completely under high load and high RPM conditions, leading to increased water temperature. Ignition timing too early: Early ignition timing can also cause engine temperature to rise during high-speed driving. Poor radiator cooling: It may also be caused by insufficient radiator cooling. It is recommended to check and clean engine system carbon deposits, and avoid excessive speed and overload operation while driving. Thermostat not opening wider: After turning on the AC, engine load increases, heat dissipation increases, and water temperature naturally rises. Most vehicles maintain original equilibrium temperature by increasing thermostat opening. If the car shows high water temperature, it means the thermostat isn't opening wider - you can check the thermostat.