You have to pull the entire dashboard and facia out to get to the evaporator, which in the UK costs about £500 to replace in labour costs alone. (2 blokes for five hours each)
The refrigerant should be cheap enough here, if he’s charging more than NT$1k to refill then get a household a/c bloke to do it. I had an 18k BTU arconditioner recharged with NT$600. I think it was either R134a or Fanta. Can’t remember.
I have fixed holes and leaks with Araldite in the past. It does end up making a bit of a bubble, but eventually it hardens. Got the last kilogramme of R12 in Ireland, I was told. A steal at £70.
The condensor either works or it doesn’t. So a used one will be OK until it falls over. All the other parts from other old knackered cars are probably knackered. There’s nothing that expensive about them, but I only know UK prices. Bound to be cheaper here. The labour is the biggie fixing car aircon in the UK because mechanics charge more than doctors.
And most people who claim to fix aircon at home haven’t a baldy, even the main dealers. They’ve never done it. New cars only need the gas topped up every couple of years and by the time a car’s old enough for the a/c system to be like a colander, you’d be mad to take it to a main dealer. So they’ve never touch a/c in their lives and they send them to specialists. I think redwagon just said that.