Audi A4

since 1994 of release

Repair and car operation

A4 Audi
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ exhaust System
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and absorption channels
+ injection System
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ ignition System
+ Lighting
+ Alarm equipment
- Tools and devices
   Check of control tools and bulbs
   The combined device
   Indicator of amount of fuel
   The indicator of temperature of cooling liquid
   Auxiliary devices
   Control bulbs above in the combined device
   Control bulb of cooling liquid
   Control bulb of level of brake liquid
   Control bulb of pressure of oil
   Control bulb of indexes of turns
   Control bulbs in devices of a round form (and nearby)
   Control bulb of indexes of turn on the trailer
   Control bulb of ASR
   Control bulb of the lock of ignition
   Control bulb of headlights of a driving beam
   Control bulb of a safety cushion
   Control bulb of ABS
   Control bulb of the parking brake
   Control bulb of a battery charging
   System of autocontrol of the car
   Ignition lock
   Check of switches
   Alarm buzzer of lighting
   Warmed back glass
   Check of screen wipers and stekloomyvatel
   Engine of screen wipers
   The help at malfunctions
   The liquid gulf for washing of glasses
   System of washing of headlights
   Mirror adjustment with the electric drive
   Central lock
   Window regulators with the electric drive
   Sliding/demountable roof with the electric drive
   Radio receiver
   The aerial on back glass
+ Heating and ventilation
+ body Details
+ Salon
Search of malfunctions
Technical characteristics

The indicator of temperature of cooling liquid

The sensor (1) temperature of cooling liquid is in the four-cylinder engine behind on a head of the block of cylinders. You will find designation of contacts of the sensor on the socket. 2–cap of the second sensor of temperature (climatic installation).

In the six-cylinder engine the sensor (2) temperatures of cooling liquid is screwed up in a tube of cooling liquid behind the right head of the block of cylinders. The socket (1) sensor here is removed.

The sensor of the indicator of level of cooling liquid (2) is established below in a broad tank (1) cooling liquid.

The indicator of temperature of cooling liquid functions the same as the indicator of amount of fuel in a fuel tank. The current from plus receives the device at the included ignition, connection to weight provides the temperature sensor on the engine. This sensor represents variable resistance which in process of heating passes more current therefore on the tool more current and the shooter moves deviates further. In one case two different sensors of temperature are incorporated. First, the sensor of temperature of cooling liquid of system of injection (contacts 1 and 3) and, secondly, the sensor about which here it was told (contacts 2 and 4).

 Council: At too high temperature of cooling liquid the blinking red alarm bulb in addition joins. Work of this bulb the microprocessor of the combined device operates. The bulb also flashes at fall of level of cooling liquid. In cars with autocontrol system instead of a lamp there is a red Kuhlmittel symbol – «Cooling liquid».

Violations in work

    The wrong indications of the indicator of temperature of cooling liquid (more often at at the same time inexact indications of amount of fuel) allow to draw a conclusion on malfunction of the microprocessor in the combined device. Absence of indication can be a consequence of malfunction of the sensor of temperature or the device. At the correct indication and at the same time blinking emergency signal the cause of defect can be also in the sensor of the indicator of level of cooling liquid in a broad tank.

Check of the indicator of temperature of cooling liquid


    Disconnect the mnogoshtyrkovy socket on the temperature sensor in an impellent compartment. Single contact to the temperature sensor (a dark blue/brown wire) on contact 2 mnogoshtyrkovy sockets extend by means of a piece of a wire and put to the bared metal (weight). Designation of contacts is on the socket. Include for a while ignition. If motionless to this shooter of the indicator will slowly move on a scale and the control bulb will start blinking, the temperature sensor was faulty – replace it. If the arrow of the indicator remains motionless, defect in a bringing wire, in the microprocessor or in the most display device. About its dismantle it is written at the beginning of head.