Audi A4

since 1994 release

Manual of the car

Audi A4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ System of an exhaust
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
+ System of injection
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ System of ignition
+ Lighting
+ Alarm equipment
- Tools and devices
   Check of control tools and bulbs
   The combined device
   Indicator of amount of fuel
   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 fluid
   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 high beam headlamps
   Control bulb of a safety cushion
   Control bulb of ABS
   Control bulb of the parking brake
   Control bulb of accumulator charging
   System of autocontrol of the car
   Ignition lock
   Check of switches
   Alarm buzzer of lighting
   The warmed back glass
   Check of screen wipers and windscreen washers
   Engine of screen wipers
   The help at malfunctions
   The gulf of liquid for washing of glasses
   System of washing of headlights
   Adjustment of a mirror with the electric drive
   Central lock
   Window regulators with the electric drive
   Sliding/removable roof with the electric drive
   Radio receiver
   The antenna on back glass
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics


Indicator of temperature of cooling liquid

The sensor (1) of 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 is removed here.

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

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

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

Violations in work

  • The wrong indications of the indicator of temperature of cooling liquid (most 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.
  • Lack 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


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