i will search on Monovalve. thanks for the tip there.

today the car ran hot up to a point and then dropped in temperature suddenly - like back to normal over a 30 second interval, and i wasn't flying down the road at that point. or those points. i thought maybe it was fan related or even a water pump problem. but i'm pretty green under the hood so i wanted to get some input before i started work. thanks.

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1984 300D "Brown (and Blue) Betty" Over 200k but the odometer isn't counting