Blowing white smoke only when ac is on on 2006 Ford F-250 Super Duty

Just had clutch fan replaced but shop forgot to replace thrmostat. I was on my way to get one when it started blowing white smoke. It had overheated and I took thermostat out to make it to where I was going. As soon as you shut the ac off it stops

Asked by for the 2006 Ford F-250 Super Duty
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