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Old 10-06-2007, 01:28 PM   #1
2nd Gear Member
Join Date: Dec 2003
Location: mississauga
Posts: 192
coolant problem

Hey guys.
I have a 2001 530I.
my rad was leaking the other night. so I replace the rad.
after the rad replacement. the expansion tank blew up for no reason.
it seem like the system is building too much pressure and blew the resevoir to
pieces. I'm wondering now is, why my rad blew on the side the first time?
Have anyone experience the problem I'm having. Is my rad cap bad, causing the pressure not bleeding out?
please help....

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Old 10-06-2007, 04:38 PM   #2
5th Gear Member
Join Date: Aug 2004
Location: California
Posts: 933
You have one of two likely causes. Bad cap not venting the pressure or worse a blown headgasket causing this. I would replace your cap ASAP because it can also lead to a blow headgasket.
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Old 10-08-2007, 11:15 AM   #3
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Location: Toronto, Canada
Posts: 1,279
what ever you do dont let the headgasket blow! lot of $$$ to replace, take it to a mechanic ASAP!.
01' BMW 530i Sold................................03' Lexus GS430 Sold...........................06' BMW 750i
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Old 10-08-2007, 06:34 PM   #4
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Location: Toronto
Posts: 21,082
did the rad blow from the neck? It's common.

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Old 10-08-2007, 10:49 PM   #5
..... kLaSSe~1 .....
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Location: Brampton
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Originally Posted by Gamite View Post
did the rad blow from the neck? It's common.
expansion tank is common also....
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