95 e300d. Has two windshield washer pumps. The hose that sprays the windshield has two insulated wires imbedded along the length that terminate near where the hose fit into the pump. Where the wires come out of the tubing near the pump, it looks as if the two wires are crimped to form some sort of thermometer or sensor. Is this "sensor" supposed to hang loose or does it belong inside the reservoir? If it belongs inside the reservoir, how does one install it?

Just a guess, but that could be the heater part of the 'heated windshield washer' that is an option on my '94 E320 wagon. Maybe your's heated too?

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles

This is a good guess, but there already is a heater coil inside the reservoir - circulates warm engine coolant. My guess is that it is a thermostat, but how does one get it into the tank? The only way is through the grommet and with the washer pump, there isn't much room. A mystery?

Wires in hose keep hose and washer fluid warm. Terminal crimp and resistor makes wires get a little warm. Adios and thanks.