A bit of a mystery - BMW Forum - BimmerWerkz.com
5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

 
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#1 (permalink) Old 05-19-2004, 09:48 AM
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Any budding Sherlock Holmes out there?

I've got a 325i convertable which I've had since new from 91. Only 80,000mls.
I've been loosing coolant, so my BMW authorised garage replaced the radiator, this didn't help. So then they said that the head gasget needed replacing, again no result so then they said the head neaded re-skiming. This didn't help. So I took it to another garage and they said that THEY wanted to skim the head. Again this didn't help.

Obviously I'm down a lot of money and I still have the problem.

I can't see any external leaks, and the consumtion of coolant seems to be getting greater.

Now for the strange bit. Recently I drove some 300 miles armed with gallons of coolant . after about 20 miles my coolant warning light came on, but as the miles passed the temperature gague didn't move.

After the journey I had a look at the coolant tank and saw that there was still some showing. When I released the pressure, the remaining coolant dissapeared.

Any advice thoughts or just hunches would be greatfully recieved.

Thanks in advance.
Mike.
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#2 (permalink) Old 05-19-2004, 09:56 AM
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frank3 is an unknown quantity at this point
Check for signs of leaks around the thermostat housing. I understand that they're prone to slow leaks that burn off before the coolant hits the ground.

More importantly, I would not use those mechanics again...a lot of money for mis-diagnosis.

PS - This is posted to the wrong forum...you'll get better response posting this to the correct 3 series forum.

<span style='color:green'>1994 325i </span>- - - 75,000 mi.
No mods - - - very happy as is!
<span style='color:green'>1995 525i </span>- - - 154,000 mi.
No squeaks or rattles... unreal!
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#3 (permalink) Old 05-21-2004, 03:04 PM
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when you open the cap, the coolant does go back into the radiator and "hide".

Are you sure its not just your coolant level sensor telling you its low when its really not??

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#4 (permalink) Old 05-21-2004, 06:33 PM
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i think you should have checked and/or replaced the hoses before doing anything. they do crack on older cars...

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#5 (permalink) Old 05-24-2004, 06:37 PM
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Winged Nut is an unknown quantity at this point
Your radiator cap is causing the problem. When the coolant is hot, the coolant expands into the overflow tank, but when the coolant cools, the radiator cap's valve is stuck and doesn't allow the coolant back into the radiator. Replace the rad cap and everything should be fine. It would be a good idea to check the water pump for leaks at the weep hole. (Look for dried coolant traces.)
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#6 (permalink) Old 05-24-2004, 06:49 PM
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has it overheated? If it did it could hav warped the cap or another part of the engine causing it to leek or burn up the coolent. Overheating in BMWs is vey bad w\ the "high-tech-ish" engines

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#7 (permalink) Old 05-24-2004, 09:07 PM
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Yep bad indeed... check the radiator cap or look for unusual leaks from the exhaust pipe.
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