2004 sable no heat
 

I like to ask what I need to look at seem the wife car sable 2004 has a heat problem.I do here a flap door inside the car some times clicking under the dash board.I did check the coolent engine runs excellent no over heat problem.The heat will some times work and some times will not .The blower motor works no problem.I stop at advance auto the other day he stated about a value inside the car has something to do with the heater system on the sable.The part was around $11.50 but it will take some doing to install it any one have idea were to look or check???

Ever found out what was wrong with the no heat problem???

blend door actuator :the major problem the 2004 sable with ETC is a dealer part only