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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.
"In the road of life there are Bimmers and there are Bimmers"
Mods: Full JDM lighting, APC bulbs, ///M rims, Four wheel Brembo rotors, Bilstein Touring suspension.
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.