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Old 04-29-2011, 11:29 PM   #6
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Join Date: May 2009
Location: Bangkok
Posts: 11
My Ride: 318i 1900cc
Originally Posted by turbo diesel View Post
That expansion tank does not exist... I am guessing it is for base e46... those parts aren't listed for M3 page on realoem where I linked that pic.

Yes I can run a hose to bypass the heater core, but I am wondering why not cut the circuit altogether. The main coolant route is within the engine block, that is just a path to the heater. If I plugged both ends I am just wondering: why not?

That said, it looks like there is no weight to save unless you get rid of AC too. The heater core itself is barely over 1lb. The only real reason to get rid of it is one less thing to maintain/break/leak, but if it causes me other problems then that is pointless too... there is a lot of CAN-bus BS that I want to make sure isn't going to be screwed up if keeping AC but deleting heater. Just bypassing the heater core and leaving the tubing extra valve/pump is not something I want to do.
Sorry for digging up this thread. Have you done it ? How?

I am currently plugging those hoses on the electric water valve. It has no problem. However, when the climate goes a bit cooler and flapper does it job, I can feel warm air from the vent.
crayonz is offline   Reply With Quote