It doesn't worth to fix it, quite expensive. You are talking about over 1000 CAD. Better save the money to buy another car. You have to ask yourself how often you need air-conditioner on?
If you plan to trade in your car for a new car, you spent 1000 CAD doesn't mean you can get 1000 more.
Maybe DKWAN can provide professional advice.
BTW, what is the make and year of your car?
风扇的一档也不好用了- seems to be switch? (I am not a mechanic, common sense)