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General E46 Forum
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Old 07-10-2011, 10:31 PM   #1
holabr
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Join Date: Oct 2004
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Leak in AC system

I have a 2001 325xi that must have a slow leak in the AC system. Last year it was not blowing cold air so I had the system recharged. The shop added dye when they charged it. It worked fine all last summer but appears to have lost some of the charge over the winter since again this year I had to have it charged. The shop checked for leaks with the UV light but couldn't find anything. Their conclusion is that there might be a leak in the evaporater behind the dash. Now that they alerted me to it, I do hear a very faint hiss inside the car when the AC is on. I really don't want to tear the dash apart to replace the evaporater.

The question is... has anyone used an AC stop leak product with any success? I am particularly interested in a product called Red Angel A/C Stop leak. http://www.usasealants.com/products/...k-conditioner/
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Old 07-11-2011, 07:37 AM   #2
TxZHP04
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My understanding is that stop leak products ultimately end up clogging internal parts of the system that shouldn't be blocked and end up creating more repairs in the long run (regardless of what they advertise). Even though replacing the evap is a big job, better to do it right the first time.
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Old 07-11-2011, 07:49 AM   #3
jbeurotech
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Quote:
Originally Posted by TxZHP04 View Post
My understanding is that stop leak products ultimately end up clogging internal parts of the system that shouldn't be blocked and end up creating more repairs in the long run (regardless of what they advertise). Even though replacing the evap is a big job, better to do it right the first time.
Also that stop leak stuff DAMAGES our shop equipment. Now because of that stop leak stuff we have had to buy a $1300 tester to check every car before we service the AC.
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Old 07-11-2011, 09:41 AM   #4
rizwan1377
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Like TxZHP04 mentioned, i agree with him that You shouldn't add stop leak stuff in the system. Try any other shop and if they tell you the same then replace the evaporator.
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Old 07-11-2011, 10:44 AM   #5
hummer
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The proper way to service the AC is to evacuate and vac check the entire system prior to rechaging.
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