Hello,
I have a 2010 lariat with nav system and heated/cooled seats. We recently purchased it and when we did there was a clicking sound coming from behind the dash and the passenger and rear ran cold when the heater was on. After doing some research I decided it must be the passenger side blend door actuator behind the NAV system. I replaced the part and now the clicking noise is gone. However the temp is still cold all the time for the passenger and backseat. I am not sure if it is related but when you hit the button for heated seats the light comes on for a moment and then turns back off again. Could it be the temperature control module? Any other thoughts on what it could be?