Oops, I didn't see the date of the original post. My screen had rust colored silt. I'm surprised anything flowed past the screen. The old wave washer looked just like the new one.

Next job is to check the cabin temp sensor. The intake doesn't suck on a piece of tissue paper like I read it should. I hear a whir from the dash so hopefully it's just a loose hose.

Sixto
91 300SE
81 300SD