Peugeot 406

Since 1996 of release

Repair and car operation

Peugeot 406
+ 1. The maintenance instruction
+ 2. Maintenance service
+ 3. The engine
- 4. Systems of cooling, heating and ventilation
   4.1. Technical data
   4.2. Connection of hoses of system of cooling
   4.3. A radiator
   4.4. The thermostat
   4.5. The electric fan
   4.6. Temperature-sensitive elements
   4.7. The gauge of a lamp of excess of temperature of a cooling liquid
   4.8. The water pump
   4.9. A heating system and ventilation
   4.10. Elements of system of heating
   4.11. Air central airs
+ 5. Fuel system
+ 6. Ignition system
+ 7. Coupling
+ 8. Transmissions
+ 9. Power shafts
+ 10. Brake system
+ 11. A suspension bracket and a steering
+ 12. A body
+ 13. An electric equipment
+ 14. The basic malfunctions

4.4. The thermostat

The prevention

At thermostat installation it is necessary to establish a new sealing ring.


1. Disconnect the negative plug of the accumulator.
2. Merge cooling liquid from cooling system. On turbodiesel engines in volume of 2.1 litres the thermostat casing is established from the right back party of the block of cylinders, and for access to the thermostat it is necessary to lift a forward part of the car. On all other models the thermostat casing (it is specified by an arrow) is established on the left forward party of a head of the block of cylinders.
3. If necessary take electroconducting and hoses from скоб fastenings and take them aside from a thermostat casing.
4. Disconnect a hose of system of cooling from a thermostat casing.
5. Unscrew bolts of fastening and uncover a thermostat casing.
6. Take the thermostat from a casing.


1. Rough check of the thermostat can be spent, having suspended it on a thread in the glass vessel filled with water, and heating up water to boiling. At boiling of water the thermostat should open. Otherwise replace it.
2. The temperature of opening of the thermostat is put on the thermostat.
3. The thermostat which is not closed at water cooling, also is subject to replacement.


Installation is made in sequence of return to removal, considering following moments:
      – Always establish new consolidation (a photo at the left – installation of a new sealing ring on the thermostat, a photo on the right – thermostat installation in a casing);
      – On models where the hose of a cooling liquid is attached to a casing of the thermostat by connection with защелкиванием, it is necessary to replace ring consolidation in a connector;
      – Fill up cooling system.