Interstar Washer System Failure

Interesting. I've got an Interstar as well, and I had a similar problem a while back. Both the headlight and windshield washers packed in at the same time. Did you check the cable connections to the pump and the relay? That's where my issue was. Is the pump making any noise when you try to activate it?

Thanks for the tip! I'll check the pump and relay connections. Where exactly are they located? I'm guessing if the pump isn't making any noise, it's likely an electrical issue rather than a blocked hose, right?

Yes, if you hear no pump activity whatsoever, I'd definitely suspect an electrical fault. The pump and relay are usually near the washer fluid reservoir. Given the symptoms and the fact that you've checked for obvious leaks, it really does sound like the same issue I had. I ended up taking mine to a workshop; they found a defective connection and replaced a short section of corroded cable. Honestly, unless you're comfortable with auto electrics, I'd recommend the same.

Thanks for the advice! I checked the connections as best as I could, but couldn't find anything obvious. Took it to a local garage and they confirmed it was a defective cable connection, just like you suggested. Repair cost me 165€. Sorted now!