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#1 (permalink) Old 03-31-2012, 06:01 PM
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525i overheats

It seems that my 2006 525i doesn't like coolant, after driving for about 5 miles I saw steam coming from the coolant bottle area after 10-15 minutes the overheat warning came on. I had it towed to my house where I allowed the engine to cool overnight. In the morning I started the vehicle and topped off the cooling system, I let the engine run without the a/c on and found that the cooling fans where coming on at around 215F both the upper and lower radiator hoses where getting hot indicating that the thermostat was opening. If you let the car sit and idle it doesn't overheat, it only throws the coolant after driving a couple of miles.I tried bleeding the cooling system but it still throughs the coolant
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#2 (permalink) Old 03-31-2012, 07:02 PM
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So you saw steam coming from under the good and then 10 minutes later the temp gauge spiked? The lower radiator hose isn't supposed to get hot. It's supposed to be cool. When it's cool it means that the radiator is taking heat out of the coolant. By both being hot it means the coolant running back into the engine is hot.

How low was the coolant level? How much did you have to add? Was their any leaks? It's common for the hoses to get old and brittle and occasionally pop off. Is the collig system still original? Several components in the cooling system were made of plastic and and became brittle and broke over time, including thermostat housing and expansion tank filler neck.


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#3 (permalink) Old 03-31-2012, 09:18 PM
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You probably got a leak,the thing is you got to run the car then you start leaking,presuusre testit if you can.if not check the water pump pulley for play.grab the fan clutch give it a firm shake pit some pressure on it.if the pulley got play water pump is junk.other wise run it and keep an eye for a leak.one la
st question any white smoke out the tail pipe.
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#4 (permalink) Old 04-01-2012, 08:25 AM
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Yeah, go for the w/pump 1st !


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#5 (permalink) Old 04-12-2012, 07:39 AM
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Anyone consider the radiator??
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#6 (permalink) Old 04-12-2012, 11:15 AM
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I usually see the radiator go last. It's usually the expansion tank that fails before the rad.


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