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The air conditioner and heater will not come on when you turn the knob nothing happens the a/c light does not comeon all the other lights will but it will not blow any air hot or cold
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If yu didn't already try, make sure your setting is not on defrost or defrost floor. This car automatically puts the setting on ac and recirculation. Turn it he setting off defrost and try again
Jeep Grand Cherokee is notorious for broken blend-air doors. This is the door inside the A/C-heater housing that switches the air from hot to cold. You must remove the dash to repair it.
unplug the heater motor and put a hot wire to it to check the motor if it blows if the wire gets real hot you need to change the heater blower motor. You will probably need to change the heater fan motor resistor. follow the heater fan wire and it will go to the resistor
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