I have a 95 dodge neon highline, automatic, I just had the entire air conditioning unit fixed, I cant remember what all they put into it, but it cost about 1000 dollars, this was about 3 months ago, and now my heater does not work, I used to have super warm heat, but now it is taking about 20 minutes while driving, for it to get even semi-warm, any ideas on what could be happening??