Only the highest speed works on my air/heat and everywhere I look, it seems the blower resistor is my problem. Where is it located on a '99 Mountaineer? Also, I went to a parts shop and there are two resistors they offer...one is a $15 resistor and the other is $100 resistor module. It's a '99 mountaineer with 4 wheel drive and has automatic temp control. Do I need the $100 module or just the $15 resistor? Any help would be greatly appreciated. Thanks!