Ah, increase the pressure - Great idea. Thanks! Looks like that's my Saturday chore..

When this all started my wife told me she heard a pop! noise followed by some spraying of coolant, but just a quart. That's why I went straight for the expansion tank and the "usual culprits" in that area as I've experienced on my E46's. Even if they were ok, we're at 100k and needed replaced regardless.

Is there anything else down in that area that has been known to go POP?

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2004 E46 M3 Silbergrau - Mein
2004 E53 3.0i TiAG - Wife's
2002 E46 330i TiAG - Sold
1999 E46 328i Schwarz - Sold
1961 VW Beetle GolfBlau Ragtop Sdn - Mein