Folks,

Don't know if this is common knowledge.... I bought an 87 SDL in Jan (FL car). No washer sensor light, but the washer fluid looks like it is water. Two days in NC and it snows, the washer fluid freezes ( at least won't come out of the squirters). Bright little me drains it and fills it "blue" auto parts washer fluid. This doesn't freeze, but the sensor light comes on. I think the sensor is now bad. Picking up another part at the dealer ( only when necessary), I ask about it. They recommend the Mercedes washer fluid concentrate - a whopping $3 to make about a gallon. Probably the cheapest Mercedes part. I drain the blue fluid, put in the concentrate and water. Now the sensor is off! I tested back and forth with a voltmeter, and sure enough the float in the sensor sinks in the blue (alcohol based) fluid) and floats in the water based Mercedes solution. Don't know if they have a "winter" version of the concentrate that doesn't freeze.

Chuck