"Doki" wrote in message
...
Steve wrote:
"Elder" wrote in message
t...
In article , nbkm57
@hotmail.com says...
if it only has one pump then it is likely the switch at fault

Looking at what I've found online, switch operates washers and wiper
sweep.
Wiper sweep works washer doesn't
Only one pump, two circuits but one fuse.
Apparently it is a pretty common fault that the front wash circuit
fails but the rear doesn't because it isn't used as often.

Looks like the missus will be booking an appointment with MrT soon
as I can convince her.
--
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I can't quite understand how one pump can do front or back washers. There
would have to be electrically operated valves or something. Can front and
back be used together? Usually it's 2 pumps clipped
to one bottle and they're extremely easy to change as long as the
wheel arch liner comes off easy, which it should do if you unpop the
plastic studs the right way.

You use two one way valves. For front washers, the pump runs in one
direction, pushing water through one of the valves. For rear window, the
pump runs in reverse, closing the first valve, and opening the second.

Front and back can't be used at the same time...

Of course, I get it now, never thought of reversing the motor. The fault
must be one pole of a 2 pole changeover switch knackered or the front one
way valve is blocked (less likely as there's no whirring sound). If it
helps, the £2 one way valves Halfords sell are OK for general purpose
washers, I had a totally blocked rear one on my Primera and the Halfords one
has been fine for 2-3 yrs so far.