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My father's truck so I am just trying to help him. 2015 and turned on A/C for the first time this season, not cold. I bought a can of the refrigerant at Walmart and had a top from another can with the gauge. I am pretty sure I found the low line but did not see any diagrams online when I did a Google. The gauge shows about 5 lbs and does not move even holding the trigger to fill the system. The can also does not feel like it is getting lighter with refrigerant coming out.

Any idea on this? Could the top for the can be faulty although I used it on several cars in the past?
 
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