I also had this problem...did some searching around and found this.
At this point I can re-install the blend door actuator, turn the temp control to cold, start up the truck and have cold air blow out, turn it to hot and have hot air blow out, but then when i try to turn it back to cold it will stay hot. I've repeated this several times with the same result.
I'm happy to at least have it to this point...at least the heater won't be stuck on anymore, but I'd like to go back to 100% climate controllability without having to constantly remove and re-insert the actuator. Any ideas on what I may be doing wrong?
98 Ranger XL 2wd 2.5L 5spd 3.45 gears
15x7 Pacer black steel wheels, 225/70r15 Cooper Discoverer ATR tires, LED front side marker lights & license plate lights, red LED dome light
GoLight #5149-M (work/off road use only).
Suspension lift, 31 or 32" tires, 4.something gears