1998 190E 2.3, 100,000 miles Looks new, inside and out, when she is warmed up she can ride from Phoenix to L.A. and run smooth.

But the moment the A/C is turned on...if you come to a stop, the engine shuts down.

She is burning quite a bit of oil...about two qts a week and in about 250 miles, so we know the valve seals are gone.

Does anyone know of a site that shows the procedure for changing the seals? And should I also be contemplating valve guides?

I never had a problem with the A/C before, but when I was injecting a can of R134a just now, the gas was going in just fine but when the can was almost empty, the engine died, (it had never done that before), now it will run fine if the A/C is OFF, but the moment you turn the A/C on and the car is stopped, the engine dies. If you are running over ten MPH and the A/C is on the car runs o.k. but the moment you come to a stop, you better turn the A/C button off or it will die at the intersection.

Was that enough clues???

Thanks to all in advance.

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2 quarts a week!?

I would say that is headgasket territory. Check your coolant for oil and vice versa, and consider a compression check--although the car stalling when the A/C is on would indicate poor compression. Make sure that your A/C compressor spins okay and isn't siezed up either. Here is a DIY for the M103 engine, yours should be similar

PeachPartsWiki: Valve Stem Seal Replacement

However as I said, I'd inspect or replace the head gasket as well.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth

Sounds like the system is over pressurized. How much freon did you put in? Did you empty out what was already in there? Did you put in a new compressor?

Valves might be toast, but it sounds like an AC issue if it runs fine otherwise.

When the AC compressor on my 500SL locked up it would stall the motor when I kicked it on. Made a terrible racket too. I would yank the belt and see how easy it is to turn the compressor. If it won't budge, then you've found the problem for the stalling.

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1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!

Presumably you had converted from R12 previously?

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Prost!