1998 Ford Ranger

Air Conditioning problem
1998 Ford Ranger 6 cyl Two Wheel Drive Manual 125000 miles

I have a 1998 Ford Ranger Extended Cab. The air conditioner was working fine a week ago and then I went to use it yesterday and it blows out hot air. When it's on A/C it always blow out hot air but on max a/c it blows cold (really cold) until the other day. I thought it needed some freon but when I checked it, the gauge read there was plenty of freon and none was needed. What could cause this to happen when it was working a week ago?
June 15, 2008.

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