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Old 07-02-2004, 12:33 PM
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condensor schrader valve leaking!!

In doing my repair of the a/c system on my 1993 190e, I found that the pin in the schrader valve on the condensor was bent by the 134a adapter. When I take off the quick-disconnect fitting there is a small leak directly out the valve, so I have simply left it on while searching for leaks in the other parts of the system. I am simply retrofitting to check for leaks, as I filled with POE oil and am possitive the system is now leak free. I used good quality valve adapters so I am confused as to why this happened, but really need to know what I should do! If I take off the quick-disconnect fitting it will knowingly leak out, I don't want to do that. If I have it evacuated, will the oil also be evacuated? Or is the oil unaffected by leaks and/or evacuation? Thanks for any guidance


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Old 07-02-2004, 12:45 PM
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Join Date: Apr 2000
Posts: 460
I think you are supposed to remove the schrader valve before you install the r-134a quick-disconnect fitting. That's what I did when I converted one of my Mercedes. One alternative is to use a tool that allows you to change the schrader (r-12) valve without evacuating the system. You see them for sale on ebay occassionally for around $45-$50. I bought one on ebay because I also had a bad schrader valve, but have since sold my car with r-12. I was going to resell it on ebay, but if you would like the tool I'll sell it to you for $40. It was only used once, and its a lot easier and cheaper than paying someone to evacuate the a/c and do the repair.

FYI, evacuating the refrigerant takes oil out of the system as well. A good a/c mechanic will measure the amount of oil that came out (via the oil-trap in the evacuating machine) and put that much back in when they charge the system. Good luck finding someone who will do the job that thoroughly.

Let me know.

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Old 07-02-2004, 12:57 PM
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Thanks for the great info! I had no idea that you generally removed that stem to convert. Looks like I ***** the bed on that one! I will consider purchasing that valve "replacer" but first I want to find a good a/c mechanic that will measure exactly how much oil is evacuated. Thanks again for the help
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Old 07-02-2004, 03:22 PM
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Join Date: Dec 2000
Location: AL
Posts: 1,219
Originally posted by GregS
Good luck finding someone who will do the job that thoroughly.
2012 E350
2006 Callaway SC560
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Old 07-03-2004, 10:31 AM
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Join Date: Apr 2000
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Hold on a second - I said this tool replaces the valve stem WITHOUT REQUIRING YOU TO DISCHARGE THE SYSTEM! Why do you still need to find someone who will measure anything?

Oh well. I tried.

Good luck.

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Old 07-03-2004, 11:51 AM
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I don't think you understand exactly the problem I am trying to describe. When I take off the 134a adapter, the scrader valve furiously spews the coolant out. I found this out the hard way, and immediately put the adapter back on, which still leaks. So the only thing that keeps this from leaking is the quick-disconnect fitting from my gauge set. Right now I don't need the quick-disconnect fitting (or the gauges for that matter) so I am going to leave it on there until cooler weather when my now functioning a/c will not be required. At that time I will evacuate and rebuild the system filling with r-12 this time and the proper amount of oil. I needed to makesure things like the condensor and evaporator were not leaking. I hope that clears that up. Thanks

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Old 07-04-2004, 09:31 AM
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Join Date: Jul 2002
Posts: 1,141
You can buy the tool he is describing -

Don't have to wait for ebay- and I think I paid considerably less. They are common at an appliance parts place. They probably won't stock one for R-12, but they can order one.

Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E
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Old 07-04-2004, 04:20 PM
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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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Old 07-05-2004, 04:30 PM
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Join Date: May 2003
Location: Boonville Indiana
Posts: 2,342
Is It Tight

Is the Shrader valve tight?????If not it might be your leak...I think you use a tool that is similar but longer than what you use on a valve stem(innertube)...I recently had that problem when we converted to 134..the new valve that screws into the shrader valve was not tight and it leaked...this was a new adapter and it leaked....Jim

James A. Harris
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