Not what it seems

After almost 2 yrs. my air conditioner in my car is fixed. yah. I had work done on it last yr. and it never fazed it. So I decided to take it somewhere else. I called back later on to see if it was ready. The mechanic said yes, but we had to order this little part.--I thought uh oh when a mechanic says that I usually think $ lol
Anyway come to find out it was not the freon that goes into the air conditioner. It was on the inside of the car.-----The knob was broken just enough to keep it from going over to colder. So now I have my cool air. Hurray