Audi A4

Since 1994 of release

Repair and car operation

Audi А4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ Exhaust system
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and channels всасывания
+ Injection system
+ Coupling
+ Transmission and the main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tyres
+ The electrotechnical equipment
+ Ignition system
+ Illumination
+ The alarm equipment
- Tools and devices
   Check of control tools and bulbs
   The combined device
   The indicator of quantity of fuel
   The indicator of temperature of a cooling liquid
   Auxiliary devices
   Control bulbs above in the combined device
   Control bulb of a cooling liquid
   Control bulb of level of a brake liquid
   Control bulb of pressure of oil
   Control bulb of indexes of turns
   Control bulbs in devices of the round form (and nearby)
   Control bulb of indexes of turn on the trailer
   Control bulb ASR
   Control bulb of the lock of ignition
   Control bulb of headlights of a headlight
   Control bulb of a pillow of safety
   Control bulb ABS
   Control bulb of a lay brake
   Control bulb of gymnastics of the accumulator
   System of the autocontrol of the car
   The ignition lock
   Check of switches
   Alarm buzzer of illumination
   Cigar Lighter
   Warmed back glass
   Check of screen wipers and windscreen
   The engine of screen wipers
   The help at malfunctions
   Gulf of a liquid for washing of glasses
   System of washing of headlights
   Adjustment of a mirror with the electric drive
   The central lock
   window raiser 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 a cooling liquid

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

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

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

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

 Council: At too heat of a 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 a cooling liquid. In cars with system of the autocontrol instead of a lamp there is a red symbol Kuhlmittel – the Cooling liquid.

Infringements in work

  • Wrong indications of the indicator of temperature of a cooling liquid (more often at simultaneously inexact indications of quantity 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 gauge of temperature or the device.
  • At correct indication and simultaneously blinking emergency signal the cause of defect can be also in the gauge of the indicator of level of a cooling liquid in a broad tank.

Check of the indicator of temperature of a cooling liquid


  1. Disconnect многоштырьковый a socket on the temperature gauge in an impellent compartment.
  2. Single contact to the temperature gauge (a dark blue/brown wire) on contact 2 многоштырькового a socket extend by means of a piece of a wire and put to the bared metal (weight). The designation of contacts is on a socket.
  3. Include for a short while ignition.
  4. If motionless to this marksman of the indicator will slowly move on a scale and the control bulb the temperature gauge was faulty will start blinking – replace it.
  5. 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 in the beginning of the head.