The washer jets are part of the wiper blade mounts, with fluid coming up a small hose clipped to the wiper arms. Detach the hose and try the washer action; if water floods out, you have blocked jets. Remove the wiper blades by lifting a plastic lever at the back of the mount, under the arm, and then the mount and blades slide out. If your jets are blocked, try some fine wire and or air (I don't recommend putting the jet in your mouth, washer fluid tastes foul
) to blow the gunk back out of the jet. But my hoses just dribbled.The hoses go to a plastic right-angle bend in the cover across the engine bay. You can pull them off to see if the blockage is in the pipe to the jets. If not, it might be the non-return valve/T-piece connected to the main feed pipe from the washer pump. At this point you need to remove the wiper arms. The round boss over the spindle is a rubber bung; insert a screwdriver in the little notch and lever it off. Mark the wiper arm positions on the windscreen with a felt-tip pen for reassembly, then undo the nuts and pull the wipers off. I had to use an old ball-joint puller; they're not that tight, just reluctant.
To access the T-piece pull the trim clips holding the bay cover down - they have a square bit in the centre that pulls up allowing the clip to shrink and flex out of the mounting holes (they are not screwed, despite looking like a demented cross-head screw). Remove the two panels filling openings on the left and right sides first - they clip in at the back and are retained by easily-broken pins at the front. Pull the main hose off the T-piece and see if there's a flow. If so, a trip to Halfords or your dealer for a new one is called for.
Mine was still dribbling, so onwards and downwards. Pull the washer reservoir filler funnel off, it's a couple of plastic barbs and an O-ring. Behind that there's a plastic plate and large diameter pipe leading into the wing. The plate's secured by another expanding plastic clip that this time looks like a cross-head screw, and may even respond to a screwdriver. Remove the plate and pipe. Now you need to remove the RH front wheel, so loosen the nuts and raise the front of the car, and remove the wheel. The washer pump and reservoir is behind the plastic wheel-arch liner. That's held by a few expanding clips (yet another variant) at the back, some Torx screws at the front, and a plastic nut to the engine bay. Then waggle it out; it's quite flexible but bloody-minded.
You should now see the reservoir. Before removing it, have a tray handy. There's a multi-plug connector at the bottom; to disconnect there's a lever at the rear that retracts the locking mechanism. Displace the two hoses running across the top front; they're aircon and air suspension pipes, so be gentle. Undo the two nuts securing the reservoir, and slide it forward, there's a projection on the back that locates its rear in the wing bracket. Pull off the outlet hose from the pump (the plastic end to the hose clips over the pump outlet), and drain the gallon of water into the tray. You did remember the tray didn't you. If not, you can use your sleeves and trousers to collect the water - I did.
If yours is like mine, the reservoir had a sludgy mixture with long streamers of gluey stuff floating in it. It's very well worth removing the washer pump - the electrical connector pulls off, and you can the rotate the pump and pull it out of the rubber bush to the reservoir. Blow through it, and maybe do some electical tests if you suspect it's dead. But take a second look at the rubber bush, it pulls out easily, and reveals itself to be a filter to keep the grot out of the pump. Mine was clogged with the aformentioned gluey stuff.
Clean it all up; "assembly is the reverse of removal", as all the best books say. I filled the reservoir with a gallon of dilute bleach and pumped it through some temporary hose to a bucket, and then a gallon of water to rinse. before refitting the wiper arms. "Usefully" this exposed the fact that my battery was dying; a trip to Halfords left me 130 lb lighter. Sorry, my wallet, not me, and £ not lb
Now the washers work like they used to.
Compared to my previous Jaguars (back to a Series II XJ6), the design and build quality is streets ahead, and the washers actually wash.