If have an obvious location of the leak start by repairing it if not have to locate the leak
3 ways to check and locate the leak
Bubble Solution Detector
This is a solution applied externally at suspected leak points. Leaking refrigerant will cause the detector to form bubbles and foam. A soap and water solution also works well.
Dye Solution
This is a colored solution that may be introduced into the A/C system. The dye will show up and color components at leak points. Some manufacturers offer refrigerant containing a Red dye. This dye-containing refrigerant is installed by normal charging procedures. Other dye solutions are visible with a Black light only.
Electronic Detector
This instrument will draw in any leaking refrigerant through a test probe, and then sound an alarm or create a flashing light if refrigerant is found. It is the most sensitive of the leak detectors used.

Answered by BMRFIXIT (expert)
19,736 answers provided

pop sound is usually a hose.

Answered by fixitmr
24 questions asked