dealer said it was ok, but wanted to look at a second opinion. They won't measure the pressure, instead they say the system needs to be drained and refilled.

I'd rather see if the 20 dollar can would work just as good as the other stuff that the dealer uses. Dealer wants 130 bucks for that.

So, can someone who knows, give me an answer?

r134 recharges arent covered by my warranty.