I've recently bought a Fiesta that has sat for a while and previous owner apparently never used AC.

I've gotten the system regassed, the front radiator had been replaced recently.

But I get no hot air from the system when AC is on, ive tested that I get cold air coming out and all the blowers push out air so not an issue there just no heated air?

The front radiator fan is really loud either when I've been driving for a bit and stopped or turning AC on the fan is super loud.

Supposedly it was a missing fuse for heater but all fuses are installed according to the fuse box and what this car can take(still need to test them all)

 

Any ideas?

Hi,

AC is a completely separate function to heating.

Do you get heat with AC switched off?  While many on here will tell you to keep AC on permanently, it does have a cooling effect which will reduce the heating effect, particularly after cold start or during short journeys.

The radiator fan will be loud with AC on.  That's how it works.  And another reason I don't use it myself unless necessary in excess heat.

If you can't get any heat at all then we need to look at an engine coolant problem next.  That is where the heater gets it's heat from.  Is there plenty of coolant in the reservoir?