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E12, E28, E34, E39, E60 General discussion and technical help for all year 5 series cars.

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Unread 09-04-2010, 02:44 PM   #1

Name: ahoffman79
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Your Ride: 1998 520i se auto
520i se auto overheating

hi, im new to this this forum and am in desperate need of some help people.

I recently bought a 520i SE AUTO and so far have replaced the radiator, water pump, thermostat and hose pipes. I orginally thought that I had a severe air lock but I have bled the system about 4 times now.

The problem is that the pipes get hot and rock solid and have to bleed the system and pour water into the main bleed valve.

No I dont know what the problem and am even considering whether it is a possible head gasket problem, although the car does not over heat on every journey, sometimes it stay normal for a week.

Please help me as this BMW is costing me a complete fortune

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Unread 10-11-2010, 01:54 PM   #2

Name: rich7669
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Your Ride: 2000 520
Hi Tony,
Is there any water under the car like when you first start it? I had an over heating problem too with mine. The expansion tank on the E39 are notorious for going bad. I ordered one for about 30 from europarts and it solved the problem. Oh it would be a good idea to replace the radiator cap too. I hope this helps solve your problem.

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