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Valve, washer system line and ignition distributor

Volvo 700, 900

22.12.2021

Worth knowing about the non-return valves of the waher system and what the ignition of the Volvo 700/900 has to do with it.


A Volvo 900 type has in it`s washer system two (sedan) or three (station) non-return valves which holds the water pressure in the hoses.
These valves can have three different defects, when they are older:

- Leakage, usually because of brittle plastics.
- Impermeability because of dirt in the washer system.
- The non-return doesn`t work anymore, so the water flows back into the washer tank.

The hoses are only pushed on the valves, you can exchange them without any tool. You also better change rough hoses or dirty filters.


Leakage ist the worst case. Not only for getting water in in the luggage compartment (only station wagon), there is one other uncongenial implication:
The valve for the windscreen washer is placed directly above the ignition distributor. If its leaky, the washer water will flow on the distributor and your car gets ignition failures.
So if you change th hoses and the valve, you`ll better set the valve a lttle to the right or left side (picture). Now your distributor will be dry, if you get a leakage in the future.


If your distributor cover is already corroded, it`s easy to exchange with only three screws.
Assigning of the ignition cables is very easy, because the identification of the cylinders is printed on the distributor covers made by Bosch or Bremi.
This prevents interchanging your ignition cables.


The non-return valve for the headlamp cleaners is behind the bumper directly under the right headlamp. This is the Version with supercharged engine, in naturally aspirated engines it is on the left side. Your can reach it, when you open the cover in the bumper.
If this Valve is leaky, you`ll get no water to the
windscreen washer. It is the same pump and in this case the water pressure is inadequate.


The valve for the rear window of the station is in front of the right tail light. Mostly you can reach it through the service cover of the taillight. Sometimes, if the hoses are very short, you have to dismantle the side trim panel of your luggage space.
This valve is often impermeable because of non-using and dirt.


A good conditioned washer system is a security feature. At a general inspection, the engineer would complain about a malfunction.
Driving with a high visibility makes more fun! 

  • All notes serve only as an example and do not replace the workshop instructions of the automobile manufacturers! All information is supplied without guarantee!

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