I smell antifreeze? Causes?

I drive a 1992 ford with 108,000 miles. I recently had everything in the cooling system replaced (radiator, all hoses and lines, thermostat & gasket) I drive about 140 miles a day and my truck is starting to smell like antifreeze coming from the ac, I take perfect care of my truck, engine has been steam cleaned it's spotless, and I do not see an obvious leak? And all the stuff was changed about 3 weeks ago

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