W/ no relation to bumps temps or time, the ABS light goes on, the idle turns rough and the a/c starts blowing warm...then just as unpredictable everything returns to normal.
I have retightened all the grounds I can find in the engine compartment.
Does anyone know if these items use a common ground and if so where that might be.
Don

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82 300D....went to MB heaven
90 350 SDL....excercising con rods

I'm not familiar with your model. Does it have the grounding points behind the instrument cluster?

From your description of how these symptoms occur simultaneous, that might be the area to check.

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Sam

84 300SD 350K+ miles ( Blue Belle )

Do a search on "OVP relay"