This is easy......get on the highway. If it freezes up, your low on freon. If it blows hot at a stoplight, your fan clutch is bad......at high speed, you have lots of air blowing thru, so fan doesn't matter. But usually your traveling for a long period of time so it has the time to freeze......FYI.....freon does NOT evaporate which means if its freezing up, you have a leak. I changed my evap last year, it was 800 bucks!!! Pull the dash, r&r, replace dash.....it'll never be as cold blowing as it was before......
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