Just wanted to ask a couple of things about my E36 320
When i idle for a long time in traffic(30 min), the car overheats and actually goes to the red zone.
I have checked the O2 sensor, fan clutch and vacuum lines.
It puzzles me coz it only does it then and it never does it when driving, no matter how hashly i drive.
Is there any chance the head gasket or water pump could have anything to do with is and if yes, does anyone know how much it would be to replace these?
i have the same problem on my 5er, not that bad, but it definitely wants to go close to red zone whenever i am stopped for more than a few minutes... water pump, gasket, fan clutch all have less than 30k on them and it still does it. i guess the next stop on my list is the thermostat...
the thing is when you are moving, the air is being pushed against the car thus cooling it. i also have a feeling that my fan doesnt spin at idle at all, because when i rev it when it starts to overheat, the temp drops.
good luck figuring it out. i'll tell you if thermostat replacement/ fix helps as soon as i get a chance to mess with it.
Check your clutch/electric engine fan and or aux fan. If you're only getting this problem while you're not moving, it probably means that there's no air cooling your rad. When you start to drive again there is air being blown into the rad so the engine cools down again. Make sure the fans are working properly and you're not missing your fan shroud. The Shroud actually creates a vaccum and aids in cooling the rad.
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Originally posted by Autotechnica@May 2 2004, 07:27 PM I thought usually when the thermostat goes bad the engine will get too cold and never warm up?
You're right. With my Montero I had to replace the thermostat in order for my engine to warm up. I'm not sure what the relationship between fans and thermostats are on BMW's, if there is even one at all.
Originally posted by Autotechnica@May 2 2004, 08:27 PM I thought usually when the thermostat goes bad the engine will get too cold and never warm up?
That's only if you're lucky. When a thermostat goes bad it can do one of two things, stick open (which they're supposed to do, and then the engine takes forever to warm up) OR if you're unlucky it will stick closed. Once your car reaches operating temp, it will just keep getting hotter cause there's no fresh coolant.
P.S. maybe the coolant temp sensor is bad.... I say check coolant levels first cause it's cheapest.
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