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Old 04-15-2011, 01:17 PM
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Join Date: Jan 2003
Location: Dallas
Posts: 792
AC compressor leak repair success!

Just wanted to share my good fortune.

I posted awhile back about a pretty bad AC compressor leak on my '91 S-Class. I couldn't tell if it was the top cover seal or the big radial O-ring in the compressor body.
After some bad experiences with rebuilt compressors, I decided to risk some valuable R12 and replace the top plate seal, even though she has over 200k miles.


Popped the top plate off, replaced the flattened Oring-type seal, and shot in 3 cans of R12 & a little oiloil. Runs very quiet and smooth, and cools great in the not-so-hot weather so far. No trace of a leak, so I plan to shoot in the last 10 oz, and hopefully live happily ever after.

Those Nippondenso compressors must be pretty durable - 20 years in the Texas heat and still going strong.


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Old 04-15-2011, 09:46 PM
Hit Man X's Avatar
Join Date: Sep 2004
Posts: 9,087
Thumbs up

I wish MB had put those on the 617 Diesel motors instead of that R4 nonsense.

Great to hear yours is holding up well. Mine is going back to the as designed R12 shortly. Expecting great things compared to the crap Freeze 12 I tried for some reason.
I'm not a doctor, but I'll have a look.

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Old 04-16-2011, 01:51 AM
mak mak is offline
Join Date: Jul 2006
Location: Westfeld .
Posts: 687
Keep us posted on the running ,incidentally where did you source the r top seal .
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Old 04-16-2011, 11:51 AM
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Join Date: Jun 2006
Location: Chandler, Arizona
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You get a long lasting compressor when you stick with the designed R12 instead of R134a, or god forbid some horrible mix.
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Old 04-20-2011, 05:00 PM
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Join Date: Jan 2003
Location: Dallas
Posts: 792
Mak, I hate to say it, but I can't remember where I got the AC gasket kit; I found it in my parts box, I had bought an AC O-ring kit earlier to get O-rings for the expansion valve, and it had two different styles of top-plate gaskets included in it. Probably from Rusty at


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