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Check for blown fuse, you may have separate blower motor for rear. You may have master switch to turn off and on for rear A/C. If so, the air wont be blowing at all.
If you have climate control it could be the main processor. Something could be shorting the blower relay to keep it on. You would also need to check and see if the system is still full of freon.
Power goes thru the rear blower relay, then the resistor and motor. The fan control switch provides the ground connection. I would check the rear blower relay if power is questioned at the blower motor.
i hadsimale problems on my taho the ac wul not blow cold n the back only the heater would blow and the front would not blow i had to chang the front blower motor and the blower motoer relay in the back every thing is on the top of the rt pass wheel hump swap them out there the same parts to see what broke hat stuf is expencive hope this helps
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