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Old 11-20-2013, 07:36 PM   #1
cwithbmw
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Replacing or decalcifying wiper fluid lines

Hey all, sorry if this has been answered before, I tried searching..

I recently replaced my windshield wiper fluid pump (my last was badly rusted), and I thought that would fix my broken fluid dispersers but it did not. I'm guessing it's a problem in the line (although the wiper fluid light still comes on), does anyone have experience replacing the lines or cleaning them?

Or could it be an electrical issue?
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Old 11-20-2013, 08:24 PM   #2
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If you fixed the pump you should know if it's coming on or not. The obstruction in the line could just be at the nozzle, you know. Have you tried sticking a very fine wire in? If not, start from the nozzle and work backwards, right under the hood...undoubtedly the most likely place you'd have developed an obstruction.

But make sure your pump is working...maybe disconnect the hose from nozzle or around there and get someone to squirt it.
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Old 11-20-2013, 08:48 PM   #3
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Sounds like two problems. The first one with the fluid sensor level and the second either the pump or the lines. There is a fluid sensor for the washer resevior, make sure it is plugged in. Check the wiring, maybe left off when replacing the pump. Same thing with the pump, check your connnection since you are there. Also do you have enough fluid in the tank? On the pump, did you also change the screen the pump fits into on the resevior? Maybe that is clogged. I would do what dmax said about disconnecting the line at the pump by having someone hit the button.

I don't know of any special cleaner you can run through there......maybe CLR??? Just a guess, I would make sure it would be safe on paint incase some gets on it.

Also check the fuse box for blown fuse. Not sure what else is on the circuit.
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Old 11-20-2013, 09:50 PM   #4
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Verify pump function. Siphon the reservoir and pull the pump strainer. Inspect, then clean if clogged & reinstall. Bend a paper clip and ream out the spray nozzles in the hood of the car. Make sure they are free from obstruction. Trace the washer hoses along their paths to verify & eliminate any pinched areas or kinks.

Don't use the Rain-X washer fluid, just in case you or anyone else were thinking about it. Whatever the Rain-X component is (wax or silicone or what have you) curdles into floaties after a while and gums the system up. My washer fluid tank was full of it when I bought the car, looked like egg drop soup on the inside. Fluid was curdled like spoiled milk. You may want to run some isopropyl through it to help clear clogged lines.
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Old 11-20-2013, 09:57 PM   #5
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That reminds me.......I think I was using that or some other stuff in my tank when the pump started to leak. It happened one morning on my way to work and I was going to be gone for like 15 hours and didn't have time to wipe it up off the floor in the morning. Upon return I went to wipe up what every was still left and it etched the feaking epoxy coated floor. Could never get it to come up. Almost like an acid or something but who would have though......its only freaking washer fluid......
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Old 12-01-2013, 10:22 PM   #6
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Thanks guys! It's weird, the pump was at first not working (brand-new pump), then tried again about a month later, heard pump working but no fluid going up and out dispersers.

Then I kept the hood up with the pump running and lots of fluid starting coming out from around the dispersers. Ended up using a needle and unclogging the dispersers and now they work fine (except one shoots WAY behind the car, it's hilarious looking).

So it was a combination of the pump not being plugged in, and and the dispersers being clogged with calcium. Was not necessary to decalcify.

Last edited by cwithbmw; 12-01-2013 at 10:24 PM.
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Old 12-02-2013, 02:54 AM   #7
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Unless you're using tap water - I doubt that's calcium. Most likely plasticizers leaching from the lines. Know how lines are nice and soft when new - but old ones are hard and brittle? Plasticizers are gone.
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Old 12-02-2013, 05:21 AM   #8
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Quote:
Originally Posted by cwithbmw View Post
Thanks guys! It's weird, the pump was at first not working (brand-new pump), then tried again about a month later, heard pump working but no fluid going up and out dispersers.

Then I kept the hood up with the pump running and lots of fluid starting coming out from around the dispersers. Ended up using a needle and unclogging the dispersers and now they work fine (except one shoots WAY behind the car, it's hilarious looking).

So it was a combination of the pump not being plugged in, and and the dispersers being clogged with calcium. Was not necessary to decalcify.
So you know you can aim the nozzles with a pin, right? Or, keep one shooting up and over the car so when some jerk tailgates you, you can at least clean his or her windshield! I actually added an extra bottle and pump and ran a line to one of the four nozzles, added a switch next to my light controls just for this purpose...I fill up the bottle with Mercedes Benz cow urine. Works like a charm.
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