Cadillac Escalade Questions

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just started overheating, mostly sits in garage. just recently noticed hole in muffler, plus brakes are going all the way to the floor, and leak in the power steering.
motor is quite
Heat system makes heat, blower motor appears to be brand new. However, blower fan will not do anything, no matter what I set it to. Wasn't sure which part to replace to fix this problem. Took out blower motor resistor thinking it was that, but it appears to be just fine. Someone had previously installed an amp in it and did a poor wiring job, old amp wires and plugs still inside dash cavity. Some wires coming from heater selector board are testing as "dead" (purple and black on left side, and a blue and black near the middle) but the other wires in each cluster are testing good. Please help...
Changed the alternator checked battery replaced starter sensor has a full tank of gas but still won't start it turns over
Noise increases the faster i drive.
Washer fluid tank
Coincidentally (?) with change to cold weather Heat Blower quit. Have lots of heat, just no blow. Then this morning it worked, but wouldn't shut off with key. Do I need new Blower, or Control Processor or ? Any help would be appreciated!
This all started about 3 weeks ago after my mechanic replaced all rusted brake lines. The brakes where bled at each wheeel.
At the end of the job I tried to back out the truck from the garage the rears seemed locked. The mechanic thought that I mistakenly hit the emergency brake but I didn't. He take off the rear wheels released the brake shoes and all seemed ok. Now it seems that I'll get entermediate locking when the trucks sits or even when I am appealing the brake for a stop.
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