We're planning a fairly long trip from north Texas & plan to take the E300D for the quietness and comfort.

As far as I know all the hoses are original. They still feel and look like almost new hoses. No sign of potential failure.

I've been creating a list of the installed hoses ( about ten, plus expansion tank ). Luckily all but two have visible part numbers ( the small long hose from driver side upper radiator to the expansion tank,

and the one that connects what is probably driver side heater outlets to a hose that goes through a grommet & connects to the wiper spray reservoir plus a metal pipe near the oil filter ) I think that part # is 124 830 55 15 but not sure since it is not showing on the hose.

So my questions are:

Should I replace the hoses or can they be expected to last for a few more years?

What is the purpose of the small diameter hose that connects to the top of the radiator above the large driver side upper hose? It goes about five feet and connects to a small plastic fitting on the upper left side of the expansion tank.

I'll try to attach pictures of both of those hoses.

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