Mine doesn't smoke with the A/C on, nor have any of my prior 124 diesels. I drove a test mule 300TD many years ago flat-out with the A/C on and didn't have any smoke either, I did blow a coolant hose though ;~(

Hard to say why it smokes, I'd suspect either intake air issues or possibly the turbo is weak if your ALDA has been adjusted, do you have a boost gauge?

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Gone to the dark side

- Jeff