Nickthegreek

Exactly. I wouldve never thought it would cause so much havoc

BenzV12

Exactly, this is what I am too using .My car popped out a warning message about that topic we are talking . I will buy a couple of those to top it off

Well Done Nick, glad you got it sorted out

Nickthegreek

Thnx. You live and you learn I guess. What has me stumped is I've been using Rain X for years and never had any problems. The stuff works awesome at repeling rain. I wonder if the de-icing agent doesnt stand up that well to temperature changes. Maybe the heating/cooling cycles it goes through from the heat exchanger to cold make it precipitate. I dont understand why they even put a heat exchanger in, windshield wiper fluid doesnt freeze

Extreme Dimensions

I would definitely replace the sensor. Had the same issue on an R230 and just swapped it out.

bha

Sensor is so cheap that if you're doing this much work you should just replace it. Bought a genuine MB sensor for $10 shipped on eBay but lots of online places have it around that price.


For those wondering about the two pumps, one is for windshield and the other is for the headlamp washers. Apparently they use two separate pumps, although (not confirmed) the pumps are exactly the same.

PilotAlan

FYI, I bought a case of Autozone house-brand yellow/orange washer fluid, and it did the same to our X204 and E550.

The GLK required a trip to the dealer (they replaced the sensor), a couple of rounds of generic blue washer fluid fixed the W212, it hadn't been in there long.

Avoid the yellow/orange stuff from Autozone.

Nickthegreek

All i ever put in now is the blue stuff to be safe

Breitling65

I start using large redish bottles or Rainex Deicer remained from the winter, I guess no more.