My 2015 coupe is getting its third attempt at getting the heater control knob to rotate to heat. The AC position seems to work OK with no problem. The three cables have been dealer replaced twice in 3 months and 300 miles the fix lasts a day or so. The first fix was under warranty, the second minimal charge $350. The new estimate is $1500 to replace heater valve. The car is no longer under warranty. The previous mechanic, he left last week, wiggled connection on back of controls and it would work for a one time shot. Any help would be appreciated the car had 9700 miles.