stand back.
Rule 1 Never go to Kwik fit, shower of sh1te the lot of them.
Rule 2 Air con is notorious for being a con mans dream
Rule 3 see rule 1
Rule 4 Air con is being notorious for people not admit they know jack broccoli about it and guess, with a sharp intake of breath and the make up something.
Rule 5, see rule 1
If air is blowing out it is almost certainly not an electrical problem, that will be a cooling problem, ie the condenser, a leak sounds plausible, however without looking I can't tell. It is worth talking to a main dealer for a diagnosis, they'll be dear but they'll have a better chance at an accurate diagnosis.
Have a good look around for an airconditioning specialist, unfortunately there are a lot of charlatans out there who will try and rrip the ar5se out of it.