Re: A/c climate control
They do the same thing just changed throughout the years. The difference is how the vacuum hoses are routed. In particular one supplies vacuum to a hot water valve which should be open with vacuum applied. The other does exactly the opposite. As long as you have the right controller, hot water shut off and vacuum routing you can use either. There is a recent post that shows the differences in hose routing.
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1968 C10 292/3 spd - sold
1969 K10 350/3 spd/205 - sold
1971 K5 350/4 spd/ 205 - sold
1970 K20 350/350/205 - sold
1969 K20 396/400/205 - work in process
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