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If it is blowing "cool" then I would leave it be... but if you insist on messing with it then research the hell out of it with an actual book on how to do it (not forums or youtube alone) if you decide to DIY and evacuate/refill properly...or take it to a shop to be done properly (probably not much $$ to evacuate and fill with no other work) but please dont buy a DIY refill can and "top it off". You are filling it blindy with those and it can actually be done cheaper if you diy it using proper methods. There is really no upside to the DIY cans especially when the tools can be rented for free. The cans gimmick marketed toward people that dont know about cars.
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