Table of contents: Constantly checking ↓ Spray jet regulation ↓ Electrically heated injectors ↓ Troubleshooting ↓
Constantly checking
Suspension from exhaust gases, oil fumes and silicone from varnish care products are constantly deposited on the glass. In warm seasons, it is therefore recommended to add detergent to the water; antifreeze is required in winter.
The water filler pipe is located on the left side of the engine compartment next to the coolant expansion tank. The tank holds approximately 4.4 liters on models without a headlight washer system.
If the car is equipped with such a system, the tank holds about 6.4 liters.
First you should pour in the detergent, and only then the water, so that these liquids are well mixed in the tank.
If the car is not equipped with a heating system for the injection nozzles, they may freeze in severe frosts.
To prevent this, a higher concentration of antifreeze is recommended. The admixture of denatured alcohol can lead to the formation of flakes in combination with the antifreeze, which can result in clogged nozzles.
Installing a regular petrol filter into the windscreen washer system line prevents the washer nozzles from becoming clogged.
Rear window washer system for Audi-100/ Avant (station wagon): The water tank with swivel filler neck is located under the cover on the right in the luggage compartment, see next page.
In vehicles with an intensive windshield washer system, the cleaning agent reservoir is located on the right rear of the engine compartment. Capacity: 1 liter.
Spray jet regulation
Despite the addition of a liquid that prevents water from freezing, water may freeze in the nozzle. This process can be prevented by a nozzle heating system.
Insert the needle into the nozzle hole.
The hole itself is located in a ball that can be turned with a needle.
Turn the nozzle until a stream of water, as shown in the figure, begins to hit the glass.
Electrically heated injectors
4 jets of water hit the front windshield of the Audi 100 when the windshield washer system is turned on. How this happens is shown in the figure on the next page.
Directly in front of the injectors is a metal housing with a heating resistor. When the ignition is switched on (terminal X), current is supplied to this resistance. The injectors are quickly defrosted by the initially high current (0.5-0.7 A). To maintain the temperature, the current after the heating phase drops to exactly 200 mA. If the outside temperature is minus 15°C or lower, the maintaining current increases to 320 mA.
Troubleshooting
If the heated injectors do not function, check as follows:
Disconnect the plug connection to the injector with the hood raised.
With the ignition on, check with a voltmeter whether voltage is being supplied.
Is the ground contact OK?
Otherwise, look for damage to the wiring.
If the power supply is OK, the injector should be replaced.