Problems with 1993 Dodge Dakota A/C system?

I'm having problems with my 1993 Dodge Dakota A/C system. Here's the scenario. I took installed a new compressor and took the truck in yesterday to have it charged up with freon. It blew cold air all day and night but the mechanic told me before I left that I needed a new clutch fan.

I started the truck up this morning and the A/C system was only blowing out hot air. I put a new clutch fan on today along with an expansion valve and re-charged the system. It's still only blowing hot air though.

So, the compressor (and it does engage and cycle), the expansion valve and new switch, and clutch fan are all new along with the re-charge and the system just blows hot air. The radiator system is full and working properly too. What am I missing here or what else could it be?

Please, include diagrams and as much information as possible when responding. It's getting too expensive now to keep installing all these hit and miss components. Thanks for looking!