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#1
07-15-2023, 01:26 PM
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Find Hole in AC Line?
The previous owner had some paperwork from their mechanic mentioning a hole in the AC line which leaked out all the gas. They quoted $600 to repair and refill. Unfortunately the paperwork doesn’t indicate where the hole was located and the shop has since closed. How can I best locate a hole in the system? I can’t find any info on AC lines or repairing them 2004 X5 4.4i
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Garage: 1997 E36 M3/4/5 Arctic Silver 2004 E53 X5 4.4i Titanium Silver 2006 E60 525i Black 2000 E39 540i Black Sapphire 
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#2
07-15-2023, 04:07 PM
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Here is one suggestion from Rob Siegel aka BMW CCA Roundel Magazine Hack Mechanic.
https://www.hagerty.com/media/opinio...ssure-testing/ He uses nitrogen to fill the system and then uses a soapy solution to find bubbles. You could also use compressed air, but compressed air has moisture in it, which is not good for AC systems - although you will likely want to replace your receiver drier anyway.. Before you do this, you might get a UV flashlight and glasses and see if you can find traces of UV dye anywhere along the AC system. My guess is a previous mechanic added UV dye to the oil or refrigerant and used it to find the leak...there still may be traced of it on your lines. The UV dye, glasses and flashlight come in handy tracing hard-to-find coolant leaks as well.
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#3
07-15-2023, 04:10 PM
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If there is a major leak such as a hole that has been open for a while you might be better off taking it to an A/C shop. Nitrogen would probably be the best way to find the leak/hole but after that there will be likely more to do.
Haha I'm a slow typer! 
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me)
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#4
07-16-2023, 08:52 AM
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If a line has a hole in it, check for rubbing marks. Especially around bends and brackets. Or replace the hoses, dryer, and stuff and charge it up.
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'06 X5 3.0i - bought @143,123 miles (12/26/20)
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#5
07-17-2023, 11:09 AM
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Also, don't assume that there's actually a hole. These cars are known for defective schrader valves. The diagnostic may have simply been "it comes out real fast."
Net-net, though, you want to pressurize the system and look for leaks. A hydrocarbon detector is really useful for this sort of thing too.
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2011 M3 2006 Sierra 2500HD 4WD LBZ/Allison 2004 X5 3.0i 6MT 1995 M3 S50B32 1990 325is 1989 M3 S54B32 Hers: 1989 325iX 1996 911 Turbo 
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