Today I removed the old A/C heater box and installed a factory NON-A/C heater box. There are 3 wires to the blower motor. Orange, Yellow, Light Blue. It seems it has 3 speeds as well........Low, Med, High. It looks like looking at the control panel off should be in the middle....High to the top.....and Low to the bottom. Only 2 speeds. What is suppose to be correct? If I unplug the yellow wire it turns off to the bottom.....Low in the Middle and High to the top. What is correct?