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post #6 of (permalink) Old 28th March 2009
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Free Fix!

I had the same problem as the OP (except I was at least washing the front window all the time!).

The way the pump works is that, when you go to wash the front windscreen, voltage is applied across the pump (obviously). When you go to wash the rear screen, the current is reversed. The result is that the motor spins in opposite directions for front and rear. This spinning then pushes a "movable plug" to block the "other" tube (that going to the window that shouldn't be washed).

The cause of the problem is that the "plug" gets stuck on one side or the other.

To fix it:
  1. Disconnect the washer pump wiring plug.
  2. Disconnect the two washer tubes.
  3. Pull the washer pump out of the washer bottle.
  4. If the grommet comes off with the pump, pop it back in the washer bottle.
  5. Pull the black & white tube connectors out of the pump body.
  6. Pull the black and white halves apart.
  7. Prise out or otherwise loosen the "plug" I mentioned earlier.
  8. Reassemble everything (be sure to push the black and white parts together firmly!), and hopefully you should now be able to wash both ends of your car again!
Currently in _SBradley_'s garage:
2004 Megane ScÚnic Dynamique 1.9dCi
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