1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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Welcome to Allpar. If you have replaced the HVAC control and it is good, that only leaves the temperature blend door actuator motor (servo). It provides feedback about the temperature door position back to the control module and if that information is missing, it will swing full hot or full cold.
Scroll down to see an electrical diagram here: http://www.justanswer.com/dodge/330bv-1999-dodge-ram-4wd-360-v8-heat-temperature-control-inoperative.html
Scroll down to see an electrical diagram here: http://www.justanswer.com/dodge/330bv-1999-dodge-ram-4wd-360-v8-heat-temperature-control-inoperative.html