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E36General discussion and technical help for (E36) 1992-1999 3 series cars. 318, 323, 325, 328.
Does anybody know exactly how the cap on the coolant reserve tank works? Yesterday I saw it leaked a little out, probably because I may have had a little too much coolant in the system. But I heard someone saying that once it vents, it has to be replaced. I figured it works like any other cap, it vents whenever the pressure goes beyond normal, and doesn't mean it's fried?? I know the thing's only 9 bucks, but damn, I just bought this one just before winter.
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Your Ride: Alpine White 1996 328i
My understanding is that it's normal and they're all designed to release pressure in the event that it's over-pressurized. The easy fix is to take a little out of your reserve tank so when the radiator over-pressurizes, and throws fluid back into the reserve tank, it's got more room to throw more fluid.
Hope this helps.
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Nah. I learned how to bleed this thing properly last summer. I did the same thing a few months ago, filled the antifreeze to about 3/4" above the fill line, and it leaked out. So I put 2 and 2 together . . if the system is well sealed, it bleeds off excess coolant out of the cap, the only place it can come out.
06-04-2006, 09:57 PM
I figured it works like any other cap, it vents whenever the pressure goes beyond normal, and doesn't mean it's fried?? I know the thing's only 9 bucks, but damn, I just bought this one just before winter.
I keep forgetting that - I have a great memory but it doesn't last long
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