The unit I am talking about bolts to the firewall and has a small coolant line that goes through it. I may be calling it te wrong thing. Either way, the old one immediately leaked down when I put a test vacuum on it. I got another used one from a guy I know and it doesn't leak down under a test vacuum. It cost $25. The crap servo that was on the car when I got it was bad and I got one off another guy I know for $10 (yes, I practically stole it) and it has all worked like a champ until now.

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1980 300d on veggie