Question about BMW 525

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My 2006 BMW 525XI was working fine all day and then I went out to air dry the car after i hand washed it this evening and as soon as I left the driveway I heard the radiator fan kick on and within I mile the overheat warning light came on in yellow and a few seconds later came on red and asked to shut engine off. I did as warned and then start back home and it started all over again. the motor was definitely overheating as the radiator hoses and motor was extremely hot untouchable. could it be a thermostat etc, as water lrevel looked good in reservoir.

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I assume you have checked the cooling system to ensure that first, that it is completely full of coolant (not just the overflow tank) with no air locks and second that there are no leaks anywhere and the radiator cap is in good condition. The heater hoses and those pesky little bypass hoses in the cooling system tend to go hard and split after a few years, allowing coolant loss. Those spring type hose clamps tend to be less effective in clamping as the hoses become hard. Worm drive ones are the best to use.

If there are no leaks or air locks, the over heating could also be caused by a clogged radiator (more than 15% restriction in the radiator flow capacity will cause overheating problems), a faulty water pump or a faulty thermostat.

If there are no leaks and water pump and thermostat are working correctly, but undetected loss of coolant once the engine heats up, then it could indicate a problem with the head gasket (Usually caused by allowing engine to become excessively overheated when cooling system has run dry) allowing very hot high pressure combustion gases into the engine water jacket, which super heats the coolant in the engine block, which then boils off, and is released via the cap. If the head gasket is really bad it will leak water into the cylinders and into the oil in the sump. This is indicated by an emulsion of water and oil mix on the dipstick.

If unsure take vehicle to a cooling system specialist and have them do a pressure test and more thorough diagnosis.

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Posted on Sep 30, 2010

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