I have a few basic air conditioner questions
- When I check for R-134 leaks do I need to use a vacuum and pressure to check for leaks? Lets say I vacuum the system down to 30" for 4 hours and find no leaks. Is this good or do I also need to apply , lets say 200 psi , to check for a positive leak. I know this sounds silly but will some seals show leaks when under a vacuum vs. pressure? Someone once told me you need to do both.
- How do you flush a R-134 system.
I read a basic Automotive airconditoner Manual , but they didn't mention this.