Question about BMW 5 Series

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Overheating at times. the car would drive far distances and be normal then it would overheat on the way back. i changed the thermostat and the mechanic said the water circulation is good. the car would idle for two hours or more and not overheat...i am so frustrated. The mechanic said it could be the thermoswitch now... my car is a 1998 e39 (520i). the radiator is less than one year old.

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Install cooler running thermostat and drill 2 hole 180 degrees apart in the thermostat. bleed system twice. make sure you get all the air pockets out of the system.

Posted on Aug 26, 2010

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Posted on Jan 02, 2017

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I'm having a problem with my Actros mercedes truck V8 cylinder is overheating when you drive long distance what are the main courses


The thermostat may be stuck closed (should overheat in 10-15 minutes, maybe less if you are driving in hills or with heavy load).

Otherwise, your fan many not be working. The fan should definitely start before it overheats and it should be running when it is in an overheat condition. Fan is on the back side of radiator.

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hey
u says that u didn't replace the thermostat yet
Your thermostat is sticking. DO NOT DRIVE if the car overheats, you can do some serious engine damage, if you haven't done so already. Get the thermostat changed out immediately.

What happened is your thermostat is sticking. It was stuck and you saw it overheat (and should have stopped immediately). The added pressure from having a stuck thermostat pushes the fluild into the overflow.

The temperature may have gone back to normal if the thermostat "finally" opened. However, since the thermostat is sticking, it is unreliable and I would get it replaced.

Driving when the engine overheats can easily cause gaskets, such as the head gasket to fail and heads to warp. If this has occurred, you're looking at a new engine.

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