Well there could be a number of reasons why the heater/ac isnt working lets start with the blower moter fuse,then after that check wiring to the blower motor & the connections at the blower motor itself.Check to see that you have 12 volts post back if you have any more questions
SOURCE: fan motor switch on 98 jeep cherokee only works on high
In many cases this is the result of the blower motor resistor having gone bad. They are often located in the housing that holds the blower motor but I cannot say 100% for sure with the Jeep Cherokee.
SOURCE: AIR CONDITIONER QUIT WORKING
I think the fan belt has got loosened. Tighten it. If loosening is not the problem, then the fan is stiffened up. Oil or grease the fan Bearing. Thank you.
SOURCE: the heater/air conditioner fan only
The resistor network is bad. Go to http://www.alldatadiy.com and get the subscription for your car. (About $20 for a year and completely covers your vehicle from recalls to bulletins to all types of repairs) There you can navigate to the heater electrical area and go to Diagrams/Locations and it will tell you or show you a picture of where the resistor network is, how to fix it, how much it would cost to buy the part, (cheap, by the way,) and anything else you may need to know. Makes Chilton and Haynes repair manuals obsolete.
SOURCE: Heater/Air blower not working.
check fuses. first then check controller before changing the blower.
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