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Don’t do it. As said before, you have to completely drain the system of refrigerant, then pull out a deep vacuum, then refill based on weight.
Yes, It can be done by DIY but is pretty in depth to do it right and not mess things up. There are different specific types of oil that need to be added at the correct qty so you don’t burn up your ac compressor. It is easy to inadvertently introduce air or moisture into the system. If you are so inclined, I suggest going to the library because there are entire books written about the subject of automotive refrigeration and AC.
The only reason you system would need to be “topped off” is if there is a leak - and if there is a leak it needs to be fixed. So topping up would be temporary and most likely cause more problems down the road.
Bottom line -
Don’t ever buy these ac fill up cans unless:
1. you are very poor
2. your car is worth $1000 or less
3. your ac is blowing hot air
3. You are not going to keep the car much longer
Last edited by Vtx531; 10-30-2019 at 06:52 AM.
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