Thursday, 24 April 2014

Fixing a not even broken windscreen washer pump and perished hose on a Jeep Cherokee '94 XJ

I've had a knackered washer pump (or so I thought) for a while now on my Jeep, so finally got round to fixing it. The washer pump and reservoir is located underneath (or above) the nearside wheel arch. It's all plastic and plastic clips in there so be warned, they pretty much all brake and needed replacing.


As you can see from the above photo, its quite a snug fit in there. A while back the Jeep had been in a garage and they decided that the best way of fixing what they thought was a knackered washer pump was to use a Ford Transit pump.. hence the proper connector was cut off on the car side of the wiring.

Pulled the old Transit pump off and replaced it with a new pump I'd bought from ebay. I had to use spade connectors and solder some wire to the terminals on the pump as the original connector had been removed by the garage.. Pump wired in and tested.. pump runs but little or no water came out of the jets. A small trickle did however appear from the nearside wheel arch (I'd seen this before but figured it was a result of wedging a Transit pump in there).

Next job was to remove the grill around the windscreen wiper arms, this is a really simple job, approx 8 philips head screws. To remove the windscreen wiper arms, there is a clip positioned near the rotation point;


in order to release the clip you need to raise the arm (as you would if you were replacing the wiper blades) and ease the clip across with a flat head screwdriver. The clip does not fully release as you can see in the picture on the left. Once the clip is loosened, you can pull the wiper arm off (pictured below left)




After the wiper arms are off, you can completely remove the grill below the windscreen. In here you can see the hoses that run from the pump and on to each jet via a splitter. On the right you can see the hose that's perished. It appears that over time the wiper mechanism has eroded the hose until it failed. So, the original pump was absolutely fine.

I replaced the hose with some fuel hose I had left over from a previous job I'd done one my camper and used a couple of small cable ties to make sure they were on nice and tight.

Refitting is the reverse of removal. One thing to remember, if you're testing your washer jets make sure you let the motor finish its cycle before switching the power off to avoid the error I made. I turned the ignition off before it finished its cycle, replaced the wiper arms, turned the ignition back on and nearly sent both wipers through the grill!

So, both windscreen washers work again. Somewhere out there is the original perfectly good pump for my Jeep...

Below is a video showing the movement of the windscreen wiper mechanism, you can see how over time a small amount of rubbing could cause a hose to fail.