These are the washer nozzles i've bought, I read one of your threads Dave where you mentioned that 850/V70/V40 all can be fitted to the 7/9 series cars.
Hmm, interesting! Nothing comes out of the headlamp wash system at all, I think it must all be disabled as the wiper arm spindles don't turn either - a problem for another day I think.
The T piece does indeed let water out, but seems to miss the dizzy cap with the bonnet open - not sure about when closed. I assumed this was designed to let the pressure out if the spray nozzles became blocked - as in this case.
I wasn't aware that there was a low fluid sensor. Where should this be? And could this explain the perpetually on '!' on the dash, or doies it have a seperate warning lamp? The handbrake warning light next to it goes out when the handbrake is released but almost never the '!'.