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Re: Not enough heat out of a vintage air gen IV system
VA has redesigned there heater control valves within the last year. They have eliminated the solonoid style 2 wire control valve. They are now running a new 3 wire valve.
A way you could check if the valve is the culprit it to "bypass" the valve with a straight hose coupler. then run the heat in the truck making sure you are on the full hot setting.
It could also be the heat door stepper motor not allowing the door inside the evaporator to open all the way.
Curious to know if your heater valve had the green and white wire or if it is the new one with the 3 wire connector built in.
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