AC leak ?????
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Senior User
Joined: Mar 2010
Posts: 241
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From: Independence, Ky
AC leak ?????
Hello all, I have an a.c leak. It usually takes about 2-3 weeks for all the refrigerant to leak out and start blowing warm air. I have used stop leak with no luck. I want to use some dye and a uv light, but dont have the extra money for the light right now. My question is , after charging the system, and getting ice cold air..... I shut the engine off, and I hear a hissing sound which lasts for about 30 - 45 seconds. It seems like its coming from the dryer area, but when I spray soapy water around all the fittings ,I get no bubbles? The sound is like air escaping...... Is that a normal sound to hear after shutting down, or could this be the source or the leak somehow? Thanks for your help Bill
Cargo Master
Joined: Jun 2003
Posts: 2,982
Likes: 7
From: Somewhere Saskatchewan
You will have a terrible time getting anyone to repair the system after you put sealant in it.
A hissing noise is common.
For a proper repair the system must be evacuated and repair whatever is leaking.
Not one person will jeopardize their recovery machines when they discover sealant.
A hissing noise is common.
For a proper repair the system must be evacuated and repair whatever is leaking.
Not one person will jeopardize their recovery machines when they discover sealant.
Fleet Mechanic
Joined: Feb 2006
Posts: 1,776
Likes: 5
From: Lorain County, Ohio
If it's the 99 in your sig, it has dye in the system from the factory.
You can use a cheap UV light from Auto Zone, but you need it in the garage out of full daylight. It also helps to shade the engine compartment. The available yellow glasses help a lot with the UV light.
Pay close attention to the compressor body and even remove the clutch plate to check the shaft seal.
Look for signs of oil/dirt around all of the fittings and crimped hose connections. Dirt/oil usually means a leak.
Regardless of where the leak is, you should flush the sealer out of the system and replace the accumulator and orifice tube.
You can use a cheap UV light from Auto Zone, but you need it in the garage out of full daylight. It also helps to shade the engine compartment. The available yellow glasses help a lot with the UV light.
Pay close attention to the compressor body and even remove the clutch plate to check the shaft seal.
Look for signs of oil/dirt around all of the fittings and crimped hose connections. Dirt/oil usually means a leak.
Regardless of where the leak is, you should flush the sealer out of the system and replace the accumulator and orifice tube.
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