I have a 2004 eclipse, my ac has 4 speeds low, med, high med,high.. my ac only works on 1,2and3 ( I can feel it a little on the highway) however my fan doesn't work on 1,2and3.. but my fan works on 4. So in the end I know they both work just not together. Is there any way I could fix it or should I just take it in

It may be a bad switch, which will require tearing into the dash for access. More likely, the blower motor resistor is failing, since positions 1, 2, and 3 don't work but position 4 does. If you decide to go for it, be sure to disconnect the negative battery cable first. You will probably feel, however, more comfortable taking it in to the dealer.