Hey need a little help, my heaters won't blow any air out, they will go warm or cold and will turn to different area but only get a little feeling of the heat when the car is at speed, I don't want to buy the wrong part and getting told 2 different things either heater blower motor or a resistor, I'm confused and don't have money to waste.. that section also doesn't light up when I switch my lights on and the aircon light doesn't come on when its pushed In if that helps...? ADvise would be greatly appreciated as Its freezing in my car