Suddenly only one works ( had to be passenger side) , poked nozzles of drivers side with pin,still nothing, pull pipe off and try its pumping out?. Assume the wiring is for the heating only so what's stopping it working when fluid is going to it?? Puzzled?.

Sorted it! Removed it and carefully prised the inlet block free to reveal a spring ( which jumped onto floor and took 5 minutes to find)! and a little orange rubber valve which had jammed into its socket, teased out and fitted spring on and clipped back together, refitted to RR pipe on electrical heating connector re plugged and tried, good as new! Sorted, time for cup of tea! 😀