Scotty explains it very well.
If you want to DIY it, it's easy, just don't do it with the cheapo cans like he shows.
Instead:
- go to a mechanic and have them reclaim your system--probably be free since they get to keep the refrigerant
At home:
You can either use a gram scale to measure the can as it drains, or (IMO most accurate) google search a refrigerant pressure chart and just fill it until the high side gauge reads correctly for your current ambient temperature.
Using this method you make sure not to introduce any air (moisture) into the system and you get an accurate amount in.
I used the high side gauge and pressure/temp chart method and mine cools good as new.
If you want to DIY it, it's easy, just don't do it with the cheapo cans like he shows.
Instead:
- go rent or buy a gauge set
- go rent or buy an vacuum pump
- go buy a couple regular cans of R134a--not the ones w/the hose and gauge, just the bare cans
- go to a mechanic and have them reclaim your system--probably be free since they get to keep the refrigerant
At home:
- hook up your gauge set and then your vacuum pump to that
- run it for 45-60 minutes
- turn on your engine and set your a/c to high
- then hook up your can(s) to fill it while it's running
You can either use a gram scale to measure the can as it drains, or (IMO most accurate) google search a refrigerant pressure chart and just fill it until the high side gauge reads correctly for your current ambient temperature.
Using this method you make sure not to introduce any air (moisture) into the system and you get an accurate amount in.
I used the high side gauge and pressure/temp chart method and mine cools good as new.
