Washing nozzle is a channel that is designed to disperse liquids or gases to a certain speed and to give the desired direction to the flow. The operating principle of the nozzle is simple and is based on the constant increase of the fluid or gas speed in direction from the inlet to the outlet section. To ensure the flow of liquid or gas pressure drop is needed, which will be exceeded on the input section.

Jet flow of the liquid from the spray valve is a little less than a droplet flow due to the complexity of the mechanism of the jet disintegration. The beginning of the jet flow is considered the appearance of short jets, from which, at a distance equal to three - six diameters of the holes, fall drops of almost the same size. When reaching a certain speed more or less sharp jump of the jet length can be observed. With further increase of the jet speed its length increases approximately linearly.

In this velocity range, along with the main drops, there are formed droplets-satellites. They are several times smaller than the main drops. At a certain velocity jet length reaches its maximum value. Formed in this mode drops sharply differ in size, but the average droplet diameter increases. Disintegration of the jet under the action of the symmetric perturbation occurs when the amplitude of the perturbation is equal to the radius of the jet. Increase of the amplitude is determined by inertia and surface forces.

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Windscreen Washer Jet (Spray Nozzle) for VW GOLF III (1H1), VW GOLF III (1H1), VW PASSAT Variant (3B6)

• clogged washer jet;
• weakening of the jet retainer;
• incorrect angle of washer spray;
• mechanical damage to the nozzle.

• no pressure of washer fluid;
• uneven washer spray;
• white or gray traces of sludge on the nozzles.

• use of low-quality washer fluid;
• using water instead of washing liquid at low temperatures;
• use of the wrong type nozzles;
• mud and debris getting into the washer tank;
• looseness of jet mountings.

To check the nozzles it is necessary to turn on the washer pressure. If the pump is running (this can be determined by the characteristic buzzing in the lower left side of the dashboard), then you need to look at the jets.

Visual state of nozzles expresses volumes. At the slightest traces of clogging you need to either clean the nozzles or replace them.

Washer nozzles lifetime depends on the quality of a washing liquid that you use. Under optimal conditions they can operate from 5 to 10 years. However, using water instead of a special liquid, particularly from a central water system, significantly shortens the service life. If you use water instead of washer fluid in the warm season, the nozzles service life will be no more than 2 years.

Clogged nozzles can be cleaned with a usual needle. However, this is only a temporary measure and the parts still need to be replaced. Furthermore, the fan-type nozzle cannot be cleaned in such a way.

You can remove the jet, prying it with a flat object. Gently push the clips and remove the item. Aplying force is not necessary, because you can break the nozzles mounting. After installing the new parts it is only necessary to correctly adjust the spray angle.

Note that nozzles for washing rear window are subject exclusively to replacement.