Re: A/c climate control
 Here is another post for you with similar info. The 3 port has a separate head for the heater control valve which is open with vacuum on. The two head as mentioned by davepl uses a "T" connector and the water valve is closed with vacuum on. The replies you have now will give you everything you need to know. I guess the recent post I referred to was actually in 2012....
http://67-72chevytrucks.com/vboard/s...d.php?t=518197
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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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