heater ac problem
i have a 99 dodge avenger v6 es. my heater and ac dont work right. blows fine but i get no heat or ac. (no ac over summer no heat this winter) when i turn the heat on it makes a loud squeel that sounds like a belt. this will go away if i push the gas sometimes. also goes away if i shut of heater. every once in awhile the heat will start working but not very often. please help. any ideas?