ndccpf1
Well-Known Member
Have a 98" B4000 (5 spd) and recently took notice on the Heater Control Valve and when it should "operate / move". I have done the blend door fix and I have also replaced the Heater Control Valve some years back.
When truck is "OFF" and I pull the vacuum line off the HCV, the pivot arm will move "down" and I can put the vacuum line back on the HCV and the pivot arm pulls back "UP".
While truck is running, and I move the heater panel knobs (temp / position) I do not see movement of the HCV. Will it move at certain engine temp ? I do know moving the temp knob will move the blend door motor / door.
Thanks in advance.
When truck is "OFF" and I pull the vacuum line off the HCV, the pivot arm will move "down" and I can put the vacuum line back on the HCV and the pivot arm pulls back "UP".
While truck is running, and I move the heater panel knobs (temp / position) I do not see movement of the HCV. Will it move at certain engine temp ? I do know moving the temp knob will move the blend door motor / door.
Thanks in advance.