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Recently, and not all the time, the wiper arms on my car are so weak that they get stuck on the last wipe of a screen wash 'job'. At first I thought it was friction with the window, but I've since tested by holding the wipers away from the window with my hands while the arms try to move it. I can feel with my arms holding the wipers that the wiper's arms are struggling to move the whole thing.

Inexplicably - other times they're fine.

I don't quite know whether it's purely mechanical, or relies on the battery, or involves rubber pulleys. Before I reluctantly take it to a repair garage (where they might quote for an expensive complete system replacement) I thought I might ask here to see if there is any knowledge of how these work in my model of car.

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I don't know a lot about Jags, but it sounds in general like the wiper motor is going out on it. – Pᴀᴜʟsᴛᴇʀ2 May 11 '14 at 18:53
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I don't know Jags either but it might be the linkage betwen the wiper and the wiper motor. On my vw I had that issue (some time the wiper were fine and some other time they would get stuck) – Rémi May 12 '14 at 1:42

I had the same problem with my 2006 Jaguar S-Type. It turned out to be the bolt that attached the wiper arm to the chassis was very loose.

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Double wiper blades are sometimes the issue.

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In what way? Please elaborate... – Nick C Jan 5 '15 at 13:16
up vote 1 down vote accepted

I wouldn't recommend this solution generally, but I'm providing it here as it's what fixed it for me.

I sprayed liberal amounts of WD-40 into the area of the mechanism, and eventually the wipers started to move freely. They've been fine ever since.

I realize this is a seemingly obvious solution, but I did try WD-40 initially and it didn't work. It was only after spraying loads of it in frustration (some time later) that the wipers started to move freely.

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