good afternoon and thank you for inquiring with JustAnswer, after reading your question i would advise you to purchase a can of refrigerant from your local autoparts store, possibly a 12 Oz or 16Oz can and follow the included instructions for the fill procedure. that should take care of the concern of not blowing cool. But what i would like you to do as well, before you add the freon, is inspect the condensor(the heat exchanger in front of the radiator) and make sure you do not see any oily stains on either sides of it, the explorers were known for condensors failing and that might be the cause why you are low, and if replacement is nessecary then you would want to wait with charging the system untill you are done. As far as not blowing hard enough, it is hard for me to tell what that might be caused by, if it is an actual concern, but the only thing that could cause that is either leaves or debris stuck in the blower motor cage if you park near trees all the time,.. or it could be the blower motor resistor, if it is the resistor then you will notice that one of your fan speed settings is the same as the previous one, meaning there wouldn't be a change in fan speed when you move the selector knob to the next higher speed. if that is the case replace the resistor
I hope my assistance helped you and you are satisfied with my suggestion/answer, please leave positive feedback as it will be greatfully apreciated,thank you
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