I should also note that I don't believe my monovalve works properly b/c I wouldn't really get cold air this winter. It's a little hard to tell now but it seemed like the only warm air I got was the air that was sitting in the vents for a while and after the initial 5 second blast of air after turning the blower on the air would go back to just a little warm.

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1983 300D TurboDiesel