Why is the A/C on 2002 Ford Taurus is not blowing cold air

My freon is fine but when I have the A/C on max the motor engages intermittently. Should the motor run constantly while the A/C is on high? If it doesn't, any idea what could be wrong? Coincidentally, a squeal from the belt started when I started to use the A/C. It squeals when I accelerate, whether the A/C is on or not.

Squealing would be a sign of a bad belt tensioner. If you're talking about the compressor turning on and off intermittently, that's the sign of an incorrect refrigerant charge--either too much or too little refrigerant.

Read this on how to test a tensioner

http://ricksfreeautorepairadvice.com/diagnose-a-belt-tensioner/

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