Quote:
Originally Posted by crystalworks
What about exhaust leaking into the cooling system from a blown head gasket or cracked/warped head? I've had an E36 and an E30 with this problem... never overheated and ran great, but leaked exhaust into the coolant system causing loss of coolant through the vent hose.
The above is kind of a worst case scenario and I wouldn't jump to that conclusion or anything OP. First things first, find out where the coolant is going. Pressure test will reveal that. If you don't see any external leaks (hopefully you do), and the system won't hold pressure... time to pull the plugs and see if you have coolant going into the combustion chambers.
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Yes, that can happen though with this amount of lost coolant it is a long shot. Also, Recall I said in an earlier post--if the cooling system is full when you turn the engine off. In this case since the coolant loss seems to be overnight there are no fumes to force coolant anywhere when the engine is not running.