I have three W116's. My 1980 450 SEL has been leaking from the receiver drier. There is a threaded bolt on the top that appears to be original. It has a splotch of white paint applied to where the bolt meets the receiver drier. This appears to be a plug. The very center of this bolt/plug has a small cylindrical plastic center that 'rose' up and started leaking. I sort of pounded on it and it smashed down like plastic. The other two cars all seem to have a replacement brass plug inserted into the top of the receiver drier.

Is this a common leak? Has anyone ever replaced that plug? I assume I need to have it evacuated, replace the threaded plug with a new one and refill?

I'd like to take the car to my A/C guy with the new threaded bolt to switch out. If you know what I'm talking about please reply. Thanks!

You probably should just replace it since if it's leaking then there is air in the system. Since it's probably been there for a while, then just replace it.

Of course, evacute the system first, then replace it, pump it down and recharge.

Even if you try to replace the plug, you will contaminate the system so do it right first!

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Regards . . . . JimF
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'94 S500 Cpe

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Yes, just replace it, but there won't be air in the system unless the system is COMPLETELY empty of refrigerant. As long as there is refrigerant pressure, air cannot get in.

Good luck,