Which one is better, the black plastic or the original brass? I replaced my last one with the brass colored one and it only lasted 3,200 miles/three years. Appreciate any insight from anyone who has replaced their control valve.
AC Delco. I don't drive the car much so maybe the valve has stuck. I tried sliding the temp. slide from cold to hot several times but that didn't break it loose.
The sliding door does not control the heater valve. The heater valve only stops coolant flow on MAX ac setting. If you have heat all the time the cable that moves the sliding door or the arm /door is broken jambed. They are not vacuum controled. Go see RC.AC Delco. I don't drive the car much so maybe the valve has stuck. I tried sliding the temp. slide from cold to hot several times but that didn't break it loose.
Are you sure the vacuum line didn't break or fall off?
Jim, when my brass valve got stuck, it was due to the ball valve being jammed up from sediment. I soaked the valve in CLR and worked the valve open and closed until it moved freely. See if you can work the valve (while it is still connected) by hand.