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Any A/C experts?

Ive got a vac pump for bleeding the brake fluid that hooks up to my air compressor. I was able to get the A/C compressor to kick in after adding more 134, got it up to 25 while running on the low side, but wouldn't hold there. Soon as I shut the valve it started to drop. Picked up a can with the dye, but not going to put that in until I get a UV light. My fng JOB won't leave me alone so I can work on my car! Stupid job.. Is the can supposed to completely empty out? Stopped rising the gauge, but still can feel some in there. FUN! I love learning how to do new stuff
 
You should only put Freon in thru the low side. With compressor running, it should suck most in. I have stuck the can into hot water while still connected to drive rest of Freon out.
 
Mustang_Charlie said:
You should only put Freon in thru the low side. With compressor running, it should suck most in. I have stuck the can into hot water while still connected to drive rest of Freon out.
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Low side yes sir. How long will the dye stay visible with UV? Can I put it in now and check it later today after I get the light?
 
If your system is too low on freon for the compressor to kick on, don't you have to bypass the switch to turn it on?
 
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