i just replaced the blend door actuator. but now when im driving its blowing cold air thru the dash vents one minute then super hot air the next. also i had a problem installing the actuator over the keyed shaft on the housing im not sure i have on all the way any ideas?? thanks

help some one tell a dummy proof way to replace blend actuator door is i got heat no matter where knob is located it has auto heat a/c controls