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It's your alternator that may be the problem. Your thinking of the battery is wrong because everything on a running car is run off the alternator. Only if the alternator dies will the car continue to run off the battery-but not for long if any accessories are used. So the alternator runs everything AND recharges the battery until it is needed again to start the car. Your alternator is barely keeping up with running the car, and is not apparently doing much to recharge the battery. Have the alternator tested.
I would not say for certain it is the alternator-there may be a problem in your a/c circuit. But first test the alternator...BTW, Kinsha, pulling off the neg. cable to check an alternator is as old school as me, but on modern electronics it is considered bad practice-electronics don't like little surges or peaks of power. Buy an inexpensive digital multimeter-it is fun learning as you go.
go get ur self a seat of gages or u can get a can of 34a and gage at auto zone in a kit hook to ur low side there is two cops they will be one red and one blue or black and blue go to the lowest one hook up the can to the hose shack hook up to the line an turn the nob
without hooking up a manifold gauge set to check high and low side pressures it makes it much harder to diagnose. however air and or moisture in the system could cause this as well as a weak compressor. or a partially clogged thermostatic expansion valve. good luck and I hope this helps!!!
There is a fuse, but the heater motor (A/C) usually also runs some other things, but it is cheap to change the fuse and see what happens. More likely is the fan speed resistor pack. It isn't the easiest thing to find, but it is usually located in the air duct someplace under the dash. Does it do the same thing on all speeds, or just on one speed? If it does it on all of the speeds, then its more likely the fuse or the motor. If it only does it on one of the fan speeds or 2 out of 4 speeds, then the resistor pack is more likely.