BMW x3 2005

Asked by Mar 04, 2019 at 11:19 AM about the 2005 BMW X3 2.5i AWD

Question type: Maintenance & Repair

I replaced the cooling system on my 2005 bmw a
few months ago now it overheating again

1 Answer


Overheating can be caused by several things. A broken water pump, for sure. But it could be a sticking thermostat, clogged radiator, collapsed hose, bad radiator cap, air in cooling system. There could even be mechanical issues with the engine that cause this. Start by checking coolant flow. Is the top hose hot? if not it's the thermostat. If it is, with radiator cap off see if there is flow. If not, it's the radiator. If flow, purge air from the system (videos on line explain this simple procedure). This covers 90% of overheating problems.

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