No A/C after fan resister replacement.

If your mechanic is calling refrigerant coolant it's time to find a new mechanic.

 

Agreed. If you took a Dodge Cummins to a gas station and asked for gasoline, then yes you would get a type of fuel, but it certainly won't be right for what you need. It might seem trivial, but it's a distinct difference and just confuses things for no reason. It's not coolant.

Back to your problem, you have been given lots of things to check. Personally I would start at the relay. If its getting signaled then you know it's trying to turn on the system. Then it's down to where is the power being lost. or a ground or the clutch could itself. If it's not being signaled, then you could have lost your charge, or the pressure sensor went out.

 

I'm not a dick, I'm/we're just guiding you in the right direction.

 

Did you remove the HVAC panel on the console when you replaced the resistor?... Maybe you have the control unplugged.