blower

Note the diagram for blower motor, You see the front blower relay, If you pull the relay, it should kill the blower motor, does it? The relay has two sides, the switch side, right side in the picture, voltage to terminal 30 is hot all the time. The control side of relay, left side in picture, needs voltage and ground. See the blower motor in picture, the top wire is voltage, the bottom wire is ground. As you can see, on and off and different speeds are controlled on the ground circuit. The ac/heater control switch/module is on the ground circuit. That circuit from blower motor could be shorted to ground, in that case, hi speed all the time or that control module is faulty? I hope I gave you enough info to do some testing. Don't replace anything unless your testing points in that direction. Just my opinion.