wifes winni heater issues

2001 winnniy i know it has something to do with the heat there is a clicking or a noise behind the climate control panel the sound of the noise changes with the temp setting can any of these fine mechanic point me in the way to repair this fault:) thanks iin advace for information

Look up blend door "actuator".

thank you for the direction of blend door it was right on and very ez i alway like to give direction on thing so simple all you need to do is remove the lower glove box by removeing the 4 screwson the sides then it just snap out from the front the and radio it dont need to come out but it help on seeing what your doing but all three screws can be gotten from the bottem