Haven't backflushed the core yet because it's been freezing. Raining now so i might try today... my coolant looks clean and new though... if the core was full of crud wouldn't my coolant look nasty too?

In other news, opened up the monovalve and the diaphram is ripped. It pops out when I turn the CCU off, and pops back in with any of the air buttons. I'm assuming it pops out to seal off the hot coolant, and the ripped diaphram lets hot coolant into the system... so this isn't my problem.

I could feel the aux pump running with the key in the on position. I tried with the monovalve open but didn't notice any coolant flow...

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1984 300CD