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Working on 2009 C300 4matic Lux. The washer reservoir was flashing low due being empty. Upon filling it was leaking where the pump connects to the little hose clip.. The hose clip has ears that attach to pump tip. When I took the hose clip off there is a wire inside. I removed the clip and just connected it with the hose alone. The tank is full but still flashing low washer fluid. Does that hose clip and wire have anything to do with it?
The wire is a heater to keep the lines free in the winter.
Removing the clip and plugging the hose directly is fine. I did the same.
If you used straight distilled water, that will trigger the light. It needs something conductive to measure resistance, vs the open circuit that it is now.
Interesting. Have a photo of what it looks like? I have a 2010 C300 4matic sport with (875) heated screen wash and the two wires are connected at the top of what im assuming is the pump. The hose connects somewhere on the bottom. Then the wires run to each nozzle and theres some type of small heating element in them. Im assuming its like a ceramic resistor, gets hot with power.
I would think if the message is saying low fluid or check fluid level it would be related specifically to the level sensor. Either dirty or damaged. What fluid did you use, ive seen people say after using a certain type of washer fluid the sensor stopped working. it was the fluid with a glass coating in it, forget the name.
I was recently in the wheel well working on the fog light so took a photo.
Only distilled water will trigger the false light. If you’re still getting the warning with store-bought windshield washer, the problem is elsewhere. Unless you’re seeing fluid leaking somewhere.
The sensors on these vehicles are EC sensors. Electrical conductivity. Eventually the calibration of the sensor no longer works. It can be that the sensor prongs are coated in the wrong salt concentration, or that the sensor has failed and can no longer even read the proper salt content. The sensor is pretty cheap and is located on the front of the tank. Get the bushing as well. As for the washer line, that is also easily replaced for about 70 bucks. For under a hundred bucks you can have them both fixed in about an hour.
Ok took the reservoir completely out. There are no cracks or issues with the seals at the pump or sensor. However the white lid where the two silver lines go into the reservoir is the problem. The lid is not snapped on completely in the back. I have cleaned, pushed etc and can’t get any force to get iit to snap. Any idea what I’m doing wrong.
Thx for the response. Yes 16 the seal and 17 the lid won’t won’t snap over the lip on the reservoir 1. Really not sure it came off in the first place. What a PITA! I need a quick fix to get the car back to my daughter at college Saturday
It appears the seal is sold with the cover. Im finding it for $8.50 at my local MB dealer if theres one near you, pick-up no shipping costs. Part# 2038690208
Op, you originally mentioned that even when the reservoir was full, it would trigger the light. So, definitely fix any leaks you have found, but that is not the cause of the low light, only the sensor will trigger that.
After removing there are no leaks leaks other than the seal/lid not attaching to reservoir. When full (before leaking at lid) it’s fine but light comes on when level gets below that point.
I have those nubs aligned and that side snaps over the lip. It's the other side that won't snap closed. Even if I push that side down it will not stay?
Hard to tell without looking at it. Im assuming that cover just snaps on the same way the blue fill cover up top snaps on. How does the lip on the reservoir look, deformed at all, plastic softer than it should be?
How does the metal coil assembly fit inside, is it touching the bottom of the reservoir maybe pushing the cover back up? From photos im seeing a black nub at the bottom that may fit in the reservoir a certain way.
How does the cover fit without the seal installed.
Went to MB dealership yesterday to pick up the reservoir cap I also took the entire reservoir with me. The new cap did not fit any different than the old one. They could not figure it out either. So they brought a new reservoir out and it did not fit any different than mine. I thought maybe it is not supposed to snap over the ring lip on the reservoir but just set somewhat snug allowing the seal ring to do the work. I came back home and tried it like that but when you fill the reservoir up once it gets to a point up the neck the pressure pushes the seal off. Everything works fine pump etc but I can't fill it to the top. So the low fluid sensor will come one much quicker. I must be missing something with the cap/seal. There is a metal support cross brace just above the cap but it does not come in contact with the cap. Here is a short clip of the issue when it is full. I am used to filling other cars washer reservoir to the top. How far up is the W204 reservoir supposed to be filled?
I fill the washer fluid right to the top so no more will fit in. Then snap the cover back on.
I was looking at photos of used covers for signs of how it goes on. To me it looks like the gasket fits inside the lip of the reservoir. Im assuming that pushes outwards on the lip and the white cover can snap on?
In the manual for removing the cover it states "unclip".
While at the MB dealer the parts department had a new cover and reservoir and they could not get it to snap on. So here I am. The cover is such a poor design. I took it apart again last night and no luck. I can get the rear part where the nub is to snap but not the other side. I gently used a heat gun hoping to get it but no way. When I had the parts out of the car I can put my weight against it but reservoir starts to collapse and still won’t go on. Absolutely frustrating for something that should be so simple. I found a YouTube video of a replacement. Of course didn’t include that part. Several comments stating the same issue as me but no explanation.
I am able to snap the nub part but with the coils inside the reservoir you don’t have enough room to get to the other side with any force. Sadly I’m dropping off car today for my daughter and won’t see her for a month. I’ll keep following the thread. Was disappointed that the dealership didn’t know how to do it!
Thanks
With the coils inside, thats why I brought up the bottom part of the coil. Is it hitting the bottom? Im wondering if the plastic piece at the bottom of the coil fits into the reservoir. Im thinking this holds the coil in a specific position so its not hitting the sides of the reservoir.
I really don’t know but I guess it’s possible. When you insert the coil back into the reservoir it’s kind of tricky and seems to allow only one way. There doesn’t seem to be any moving around once in. It is amazing that there isn’t any information about this. I’ve got two kids that are engineers I keep saying that as they design things to make it intuitive for others!
I was thinking about the fitting of the coil inside of reservoir. While I was at the MB dealer the parts guy could not get new lid to fit on new empty reservoir? So the orientation of the coil would be eliminated. What could be the problem and more importantly what is the solution?
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