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#1
02-18-2014, 03:50 PM
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Techniques to finding AC leaks?
I had a long battle with my 300TE where I got really proficient with my vac pump and guages.
Our CLK320 has developed a leak 10 bar to 5 bar overnight. Instead of me taking to a shop to find the leak I would like to learn the best technique and or tools to get this fixed. Any advice here? Thanks
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k 
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#2
02-18-2014, 04:13 PM
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Dye and a black light its the best technique I know of. At the rate you're loosing refrigerant you should be able to hear it hissing in a really quiet environment. I used a free amplifier app on my android to find a leak on the old 190.
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CENSORED due to not family friendly words 
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#3
02-18-2014, 04:20 PM
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Leak dye is the most sensible and logical option. Hopefully not the AC evaporator.
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#4
02-18-2014, 07:48 PM
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Electronic "sniffers" are another option if you can find them cheap, although the can sometimes be confused on a freshly charged car residue left after the charge throwing a false flag.
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1991 300d 2.5 Turbo OM602
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#5
02-18-2014, 08:11 PM
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I don't want to put any dye that has any conditioners of any kind. Can I be assured I could find one at a local parts store?
__________________
2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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#6
02-18-2014, 08:15 PM
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Quote:
I think Harbor Freight has a cheap freon detector that might work for you: Electronic Freon and Halogen Leak Detector
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#7
02-18-2014, 09:07 PM
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Dye can be bought and injected using refrigerant as a push, autozone has just dye and injectors, I do not know if it plays nice with r-12 though.
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1991 300d 2.5 Turbo OM602
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#8
02-18-2014, 09:09 PM
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r134a so no issue.
__________________
2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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#9
02-18-2014, 10:27 PM
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If the CLK has the same evaporator as the W210, I would suspect it has split inside the dash.
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-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250
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#10
02-19-2014, 08:22 PM
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Quote:
__________________
2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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#11
02-19-2014, 09:14 PM
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I have a verrry baaaad feeling I am right behind you on my W210. First warm day in Columbia last weekend this spring and the ac is weak again...
__________________
The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech
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#12
02-19-2014, 09:30 PM
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Quote:
10 bar, is a temp of 105... is it this hot where you are? or is the car just warm during this measurement ? 5 bar is a temp of around 75, this would be the temp outdoors...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#13
02-20-2014, 11:51 AM
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I have a leak on my car that I suspect is the evap. I'm sure it's been a problem for quite a while because when I add refrigerant, I can see evidence of dye in the charging port.
I bought a dye injector from Autozone and looked around with the flashlight and glasses but I see nothing. That's what makes me think it's inside. I have this vision in my mind of taking the whole dash apart and finding the air box awash in neon yellow poo. Oh and one other thing. I think Harbor Freight has electronic sniffers for not much money. It might be worth it to invest in one.
__________________
-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250
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#14
02-20-2014, 12:22 PM
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If you suspect an evap leak, look with the light at the condensation drain for the yellow die.
Works sometimes, but not always. Paul
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84 500 SEL (307,xxx miles)
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#15
02-20-2014, 03:15 PM
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Quote:
Do the HF sniffers detect 134a? I thought vstech told me something about the fact that a sniffer can't smell 134, you have to evac and then charge up with N2 and 4 oz of R22 for the sniffer to find it.
__________________
The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech
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