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#detectfreonleak #carairconditioner #freoncheck How to detect (check) a freon leak from an air conditioner. A simple way. Check all the sealing rubber bands in the air conditioning system parts. They are located at the joints of all the system tubes. The sealing rubber bands tend to dry out. Microcracks appear at the abutment joints through which freon escapes. We tell you where all the rubber bands are located and how to see a freon leak with a flashlight. Why you need to protect the ports through which the air conditioner is filled. Useful tips.