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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 12-11-2011, 05:04 PM   #1
sbass237
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Arrow 1995 525i Overheating Problem

My beamer is overheating. I am learning how to do some things online but still need help--because the car still over heats. I replaced the water pump and got a new thermostat but the guy at a different car store told me after that it was not the right kind for my car. So I took out the thermostat, let it run without the thermostat and it overheated. I thought at first the thermostat wasn't letting through enough water. Then modified the thermostat so that there is actually a thermostat in place but it is open all the time enough to let water through. I don't think there are any leaks in the hoses or the radiator. And I am not sure if I can replace a head gasket or if it is even a good idea for me to mess with that stuff. My buddy told me to come to this site and ill get some good ideas. Thanks a lot.
John
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Old 12-12-2011, 03:01 AM   #2
Vic328CSi
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is it overheating when its idling? or when its being driven? When did the problem first appear?

I am assuming you have properly burped the car to make sure there is no air trapped in the block. If you havent done this, then stop right there, go learn how to do it properly for your car. If air is blocked in your cooling system, and its not bled properly then coolant doesnt flow and it will overheat.

Im not familiar with the 5 series, but if its overheating at idle but not when its moving its most likely an issue with the fan clutch (if equipped) or the electric fan. If its overheating while driving, then its most likely needs to be bled properly.

Last possible cause of persistent overheating is blown head gasket, but if this is the case you will see white sweet smelling smoke in your exhaust, milky white residue in your engine oil and coolant loss.
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Old 12-12-2011, 10:51 AM   #3
BMWCaptain
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Need to find out if you have a coolant leak.

Check coolant level.
Bleed your system of air.
Check if electric fan is coming on.
Check temperature sensor
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Old 12-12-2011, 10:54 AM   #4
sbass237
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Arrow

It only overheats when its being driven. This started 6 months ago so I haven't been able to use the car since. The electric fan seems fine but someone else also told me to bled the cooling system as well. Right now, the bled option looks like its my last option. Now I am worried about is how you said if it loses water it might be the head gasket--unfortunately it does lose juice and every time I test drove it, I ended up having to put more coolant. Thanks for the quick response,
John
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Old 12-12-2011, 11:33 AM   #5
Vic328CSi
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If it loses coolant with no visible signs of leakage (like from hoses, expansion tanks or waterpump) then it may be a head gasket issue.

How does the car run? Usually if its a head gasket, you will have rough running and also cylinder misfire codes, did you check if you have any? Also did you check the engine oil for milky residue?

Easy way to check for head gasket is to pull out the spark plugs and check if any of them look "steam cleaned". Normal plugs will have some soot on them, but if they look unusually clean at the tips, then you know that cylinder is fvked.

On some older bimmers, in order to properly get all the air out of the block, you might have to raise up the front of the car on jacks to give air a path to escape, then bleed the **** out of it. Also you should have your heater turned to full hot max air during bleed process.

Do the stuff in BOLD then come back with updates.
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