If it is a Schader valve, like the one in our bicycles, the inserts should be removable. You just need a special tool, available for sure at home a/c supply stores. The insert has to be rotated to remove.

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Saumil S. Patel

I am tracking like a freight train on the idea of replacing the drier and the receiver and even the expansion valve and the seals. My issue is past that. After opening the system and vacuuming it down and refiling the freon, I am lost. My 16v is switched to R134 and until this week has always been ice cold. It has been 95 -97 each day and if i let the car idle or have to stop for an exrtended period of time, the a/c goes hot and stays hot until I stop the engine. Then after a short shut down, even 5 minutes, I restart the car and the ac is typically ice cold again. ANyone know what my issue might be. I am working on getting the new drier, reciever and seals and valves, but I dont know what is causing the hot ac on idle or car not moving.

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red

Christopher, the first things I would check are the fan/clutch and the electric aux fan.

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2012 E350
2006 Callaway SC560

After you shut down for a few minutes and on restart when the a/c works again, does it work on idle for a while ? When the a/c stops blowing cold air, do you see the compressor cut off ? I am trying to understand whether it is mismatch in the engine and the compressor RPM that is causing the compressor to shut off and therefore causing a loss of cooling OR is it the engine temperature OR high compressor outlet pressure (possibly because your aux fan may not be working) that is causing the compressor to shut off.

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Saumil S. Patel

The 16v I have dose not have a visco fan clutch, it has the magnetic clutch and it was replaced 2 months ago and appears to still be working correctly. the aux fan also seems to be working as it should. It is also on when ever the A/c is turned on as it should.
The engine temp does not seem to be any hoter than normal, 80-90. I seem to have a 16v 190E that actually has no overheating issues as of yet.
As far as if the compressor is kicking off when the ac goes hot, i am not sure. I have been in traffic most times and can stop easily and check.
I think the a/c is staying cold for at least a while even while idling after the car is shut down and restarted and the a/c has gontten cold again. I would say that it stays cold at idle for at least 10-15 minutes, not really timed it, usually, I do a restart and it is cold and I am off. I will start checking it. I typically dont use it as a daily driver so I am just starting to get the whole issue defined. I used it for a 2 hour trip last week on the highway and it was 95 outside and the a/c was freezing us out the whole way, not a single issue. Now it seemed to go hot and then cold again, then hot 4 times in 2 hours today alone.

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red

Info on non-removable valves: Click Here

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2012 E350
2006 Callaway SC560