Hi i'm ryan, is it blowing cold air, or just won't come on at all? If its blowing cold air try checking the antifreeze level, low levels will cause it to blow cold air. If it is just not comming on at all, try checking the fuse for the heater.
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there is a blower relay circuit board located right by the blower motor which sounds like your problem to me i've worked on several that had the same type problem and thats what it was. the two blower motor wires will plug into it and there are two screws that hold it on
we talk her about any fan ( blower ) or (condenser) fan .what you ( repaired twice ) .why you
remove the dash .how many fan motor you have . if you turn on the heat or ac thesmoke start come from where . you say its fried (any part) .
does your cruise control work??? I had no heat or a/c intermittent, and cruise did not work. I replaced the ignition switch (behind the key) and everything works fine now. Switch was 80 dollars and about 2.5 hours of work... the shop wanted 450 dollars.
if your ac blows hard and cold then it could be your heater core, but most likely the thermostat is going bad. When those fail it leaves the radiator in an open position and all your coolant goes through your radiator, so when its cold out its hard to get warm air out of your heater. IF it were my jeep i would take it somewhere and have the radiator and heater core flushed and check the thermostat. IT can be done yourself but requires some flushing agent from auto zone or auto parts store and some time and auto knowledge.