2 problems?
No blower motor: Blower motor resistor very common or motor itself or heater controls.
No heat: Start simple with check antifreeze level after vehicle has sat for a few hours. If that's OK then it could be thermostat, heater controls, blend doors, water pump, restriction in cooling system
SOURCE: 2001 Jeep Grand Cherokee which fuse controls heated seats?
Fuse # 20, located in the Junction Block (interior, drivers side). This is a ten amp fuse.
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Read the information at the above site. The TSB (technical service bulletin) may be of interest to you.
SOURCE: heat/ac not working on 2004 Jeep Grand Cherokee Limited
look for Main A/C relay, look for fuses, or go to a/c shop and have gas check out, perhaps leaks, perhaps evaporator, perhaps condenser, but start for relay box on front passengers side, or fuses on same side
SOURCE: 2005 jeep grand cherokee ac blows cold only on drivers side
I agree, these vehicles have a problem with the blend doors and since the accuators hit the door when it opens and closes, it breaks the doors. and it's a huge job to replace them.
SOURCE: 97 Jeep Grand Cherokee only blows heat and ac out of dashboard
There is a vacuum leak under the hood. If it's a 6 cylinder, look on the drivers side for a vacuum line that runs vertical with a 90 degree angle fitting to the manifold. That one usually comes off. If it is a V8 look on the battery side for a broken or corroded vacuum line.
SOURCE: 1999 Jeep Grand Cherokee - the blower works but
does the air blows only on the windshield? if so there is a sensor located inside your dash board that need to be replace. Go to MSN.Auto and type in your vehicle under used cars and check the reliabilty it will tell you this and more.
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