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      12-23-2012, 03:34 PM   #8
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doughboy's Avatar
Drives: E91 335i Sold.
Join Date: Jan 2009
Location: UK

Posts: 6,375
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Hmmm. sounds like a leak.

How often do you fill it? what pressure does it drop to and what pressure do you refill it to? Is yours an old house with old rads/pipes from gravity fed pre-combi days?

Does it drop even if the heating is off?

The overpressure valve won't release until at least 3 bar, so if its the EV you'll see the pressure go up when the heating is on, then it would blow off at 3 bar or so. If the pressure only goes up a little when the heating is hot then it ain't the EV...
335i gone E63 AMG here at last!