Chasing A/C leak

[vtx1800sba]

Guys I'm working out the bugs on my new 96 Hoe. I've had the a/c recharged twice at a shop that has the a/c machine with all the gauges and infrared dye. So far they can't find a leak. I thought I could hear a hiss coming from through the grill. But when I opened up the hood I could see condensation coming off an a/c line coming out of the compressor. It appeared the condensation was coming from twinkee sized thing built into the line.

Any advice tracking down leaks?

 

[Stresst]

Guys I'm working out the bugs on my new 96 Hoe. I've had the a/c recharged twice at a shop that has the a/c machine with all the gauges and infrared dye. So far they can't find a leak. I thought I could hear a hiss coming from through the grill. But when I opened up the hood I could see condensation coming off an a/c line coming out of the compressor. It appeared the condensation was coming from twinkee sized thing built into the line.

Any advice tracking down leaks?

If you do not see anything under the hood or in the wheel well behind the passenger rear tire there is a good chance the leak is in one of the evaporator box's. BTW do yo have rear air?

 

[vtx1800sba]

Don't think I have rear air. Never looked. Will in the morning.

 

[SunlitComet]

First I did not know there was an infrared dye. second why not use a uv dye. Look for dirty oily residue around joints valve and what not.

 

[vtx1800sba]

Miss spoke that one. It is UV dye. No rear air in my 2door. Mechanic said something about evaporator boxes. Since this tahoe sat for months at a time without moving, and probably the air wasn't turned on for a year or perhaps years at a time who knows. compressor works. clutch system does to.

 

[gpracer1]

For leaks you cant see (just vapor with no oil) we used to use the handheld sniffers that give an audible tone when it detects freon. They are VERY sensitive. First thing I would check is the compressor shaft seal with the sniffer.

 

[SunlitComet]

+1. If it has not been operated in a long time then you compressor shaft seals are probably leaking which are hard to see visually.

 

[vtx1800sba]

The guys used the hand held sniffer. It whoopeed once at the low line port. Rechecked it and no more noise. Checked all around the entire system. Not a noise.

---------- Post added at 05:31 PM ---------- Previous post was at 05:30 PM ----------

Got an image of where that is?

 

[2drhoeon4s]

mine was leaking out of the bottom of the compressor onto the bracket. I had the same air noise... I found the leak because there was a puddle of green on the bracket..

 

[SunlitComet]

The shaft seal is behind the clutch assembly which would need to be removed to see if you can sniff it out or see leakage. With the engine running it would be diificult to find a shaft leak with a sniffer because of the blowing fan.