<DIV class=hd>
<H2>I have a 2000 Cougar which has been messing up on me lately, the AC/Heater/Defroster will sometimes work and sometimes it doesnt. Lately it hasnt been working for me at all? What could it be? Could it be something small and least expensive or something more? Thanks</H2></DIV>

how is it messing up. is it blowing out the floor instead of the vents/defroster? Is it not heating? is it not cooling? what exactly does it do when it messes up?