Audi 80/Avant (B4)

since 1991-1995 release

Repair and operation of the car

Audi 80/Avant
+ Technical specification
+ Engines
+ System of production of the fulfilled gases
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ System of injection
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrical system
+ System of ignition
+ Lighting
+ Signalling devices
- Devices and auxiliary devices
   Check of indicators and signaling devices
   Elements of a combination of devices
   Indicator of amount of fuel
   Indicator of temperature of cooling liquid
   Voltage stabilizer
   Additional devices
   The top indicators in a combination of devices
   Indicator of cooling liquid
   Indicator of brake system
   Oil pressure indicator
   Indicators of indexes of turns
   Lower indicators
   Battery charge indicator
   Indicator of indexes of turn of the trailer
   Safety cushion indicator
   Indicator of anti-blocking system
   Indicator of a driving beam
   Indicator of the parking brake
   System of self-examination
   Ignition lock
   Check of switches
   Buzzer of shutdown of lighting and radio
   Heating of back glass
   Check of screen wipers and windscreen washers
   Screen wiper engine
   List of malfunctions
   Screen wiper of back glass
   List of malfunctions
   Replenishment of a washer reservoir of glasses
   System of washing of headlights
   Audio system
   Antenna of back glass
   Electric regulation of external rear-view mirrors
   System of locks with the central management
   Power windows
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Indicator of temperature of cooling liquid

The sensor of the ambient temperature (shooter) is located in a bumper behind a front grille at the left.

At the left: under the temperature sensor of system of injection (2) the model with the 5-cylinder engine has an electronic thermoswitch (1). Scheme of an arrangement of contacts the following:

T – temperature indicator;
R – conditioner;
+ – food;
With – a control bulb "an overheat of cooling liquid".

On the right: models with the 6-cylinder engine have the same electronic thermoswitch (shooter) with the identical scheme of an arrangement of contacts. It is screwed in in the pipeline with cooling liquid, behind to the right of the engine.

The indicator of temperature of cooling liquid operates approximately as well as the indicator of amount of fuel. Food arrives to the device at the included ignition, connection on "weight" happens via the temperature sensor on the engine. This sensor represents resistance passing the it is more than current, than temperature so the bimetallic element in the device heats up more strongly owing to what the needle deviates further is higher. In Audi two various types of temperature sensors are used.

  • The standard sensor (combined with the switch "overheat" for a signaling device of temperature of cooling liquid). It is established in the models with the 4-cylinder engine which are not equipped with the conditioner.
  • Electronic thermoswitch (has also other functions) in the models with the 4-cylinder engine equipped with the conditioner and also in models with 5-and the 6-cylinder engine.
  • Arrangement of contacts of the temperature sensor – on illustrations.

 Help: at too high temperature of cooling liquid the red blinking warning signaling device in addition lights up. In the cars equipped with system of autocheck there is a "cooling liquid" symbol.


  • The inexact indicator of temperature of cooling liquid at at the same time inexact indicator of amount of gasoline indicates the damaged voltage stabilizer.
  • Both the temperature sensor, and the device can be the cause of completely absent indication.
  • At the correct indicator, but at the same time blinking signaling device it is necessary to check the sensor of level of cooling liquid located in a broad tank.

Check of the indicator of temperature of cooling liquid


  1. To separate the plug of the temperature sensor in a motor compartment.
  2. To extend with a slice of a wire separate plug contact to temperature indicator (a blue-brown wire) in the multicontact plug and to bring to the bared metal ("weight").
  3. For a while to include ignition: if the indicator needle motionless before starts moving on a scale now, so the temperature sensor is faulty – to replace.
  4. If in the indicator changes nothing, so there is a gap in conducting, or defect of the indicator. Its removal is described at the beginning of the head.