Hi all,
So recently I've been having some trouble with my rear wiper washer jet, when I first got the car (second hand) it could spray water just fine but recently it's only dribbled out until it finally got blocked up (despite taking it to be checked during its MOT where they said it was fine, and once again when it was finally blocked). The dealer said it was a result of some corrosion and might not be covered under warranty and that I had to wait for a reply from Skoda... 🙄 I asked for photos but they couldn't give any, saying that there was a blockage somewhere in the rear wiper motor unit after testing and attempting to clear the blockage (or at least that was the gist of it). I wasn't really happy with their service, the technian left clips unclipped, one was bent, a plastic tab with a clip had completely come off the backing from the trim and one of the rubber seals wasn't properly refitted and sealed.
Suprisingly there was a recent post on here on another hatch experiencing the same issues, so it seems like this is not an uncommon issue but now I've had my hand at it and sorted it out. 😁
There are a few things you'll need to have and check:
1. The two washer pumps work - when you push or pull the washer stalk you should be able to hear two different motors working away.
2. That the washer pipe hasn't burst/split - if it has you'd probably have noticed some wet patches somewhere in the car or at least heard water being jettisoned.
2a. Likewise you should check to see if the blockage isn't in the pipe, but this fix only focuses on the end of the pipe.
3. The rear wiper motor works.
4. The rear washer jet nozzle hasn't been blocked - this would be easiest way to clear the blockage, just lift the cap and pull the nozzle off. You can easily wash or clear it with a needle pin, brush or with a water flosser.
A few tools you'll need:
You'll need a trim removal bar, something plastic that can help give you leverage while removing the rear clips.
A long toothpick and some palstic trimmer line - the bottom washer hole is about 15mm wide whereas the top one is a lot thinner, a bit larger than a toothpick.
A fine needle pin for the jet nozzle
A water flosser - you could use a pressure washer but I think you'll have trouble directing and controlling the water into such a small pipe.
Towels, a bucket and maybe a second pair of hands.
Once you've checked and gathered all that, I have a good suspicion that the blockage is in the same place where I had mine. The blockage appears in the right angle part washer pipe of the rear wiper motor.
Firstly you'll need to remove the entire rear door trim (video guide here) - start with the interior hatch button from the sides, it'll fall out and this is where you'll need to push the clip in at the top of the connector to remove it. It's a good idea to turn off the interior lights and be aware of where the exterior rear door latch button is just in case you activate the automatic lift by pushing up or down on it.
Next remove the two rubber stops by simply unscrewing them.
Now this is the hard part, trying to remove the trim from the clips. I'd start near the latch and work where it's loose. You'll also need to remove the first three clips of the side pillars, the best way to remove them is to grab the edge, pull them down and inwards until the clips come loose. You don't have to remove them all, maybe two or three clips so that you can remove the rear trim.
So now that you have the whole trim off you have the rear wiper motor exposed and now you'll need to locate the washer pipe (the ribbed pipe lined below).
To remove it, you'll need to twist the white locking piece.
Remember the the way it goes on, it should lock into place and that the black rubber ring is still inside the pipe. If you have a pipe cleaner you can clean the immediate area of the pipe or you can even try and use the washer jet, just make sure you have a bucket (though it'll only work if the car thinks that the rear hatch is down).
Make sure you reconnect this properly, if you don't put this securely back on the pipe could come loose and spray inside the boot.
With that done you'll now have access to the blocked area. I would also remove the plastic nozzle jet on top too, just lift the cap and wriggle the nozzle jet free. You can use a needle pin or a water flosser to clear it.
Now back on the underside, you can now use the plastic trimmer wire, toothpick and water flosser to probe and clear out the blockage.
Here you can see just how dirty the toothpick got. I didn't get a chance to take photos but the trimmer and water flosser had gotten some debris up and out - I also found a single red strand of thread clogged up in there. Do the same on the top and clear the shaft, just make sure you have a towel or bucket underneath to catch the water coming out.
Now that you're done test the washer function out. I tried the rear washer and I was amazed at the pressure that was coming out, It was way more powerful than the first time I had gotten the car all those years ago, it's like a proper jet wash.
Of course, with some slight adjustments to the nozzle jet I was able to get a much more sensible spray that won't strike cyclists, pedestrians or other cars. 😜
Now that you've cleared the blockage, make sure you wipe down and dry all parts that might've gotten wet on the inside of the trim, especially near any connectors and then do everything in reverse.
Just be aware of the rear elements cable when reattaching the trim, you really don't want to snag this and break it off. I would highly recommend starting here.
Hopefully this'll help as a guide for those who might have this same issue (and save you from buying a rear wiper motor unit).