It is refered to as a "bowden cable" by adjusting it you can change the shift points of the transmissions. Yes the problem will get worse when it gets colder out. Yes you will have to hold it longer, this is assuming you can get it running.

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k