2000 (pre-facelift) SLK230 Kompressor (R170)

As soon as the engine reaches operating temperature, it cuts out or stalls. If the car is allowed to cool down, it will restart and run all day.

Can anyone help with this? It has my mechanic stumped.

Thanks in advance.

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JJ Rodger
2013 G350 Bluetec
1999 SL 500
1993 E300 diesel T
1990 190