How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Doug Your Own Question
Doug, ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 8622
Experience:  Mitsubishi employed and Factory trained ASE certified technician
Type Your Mitsubishi Question Here...
Doug is online now
A new question is answered every 9 seconds

I'm trying to figure out why the knob I use to turn my vents

Customer Question

Hello. I'm trying to figure out why the knob I use to turn my vents to defrost is hard to turn and will not move the vents. Is it a blend door problem or is it the unit itself? Thanks
Submitted: 1 year ago.
Category: Mitsubishi
Expert:  Doug replied 1 year ago.


If you are having difficulty with the physical act of turning the knob, then this is nearly certain to be a blend door problem.
what i would do first is check the cable under left side of the dash... unhook the mode cable and then see if it turns smoothly. If it does then you know the mode door is at fault, and you will need to pull the dash and HVAC box out for mode door replacement.
If however the knob is still hard to turn with the cable unhooked from the HVAC box, then the cable itself probably has a kink in it. The actual knob is not likely to have any problem causing this by itself.
For what it is worth... when we see this where the knob goes almost all the way to the end of travel then stops, there is usually a small piece of debris in the door track... most often from pieces of the defroster grill having broken off and fallen into the hvac box.