Removal
The thermostat is located in the coolant outlet pipe at the front of the cylinder block.
1. Drain the coolant.
2. Unscrew the 2 mounting bolts –1– and remove the connecting pipe –2– from the coolant pump. Collect the leaking liquid. Move the pipe with the attached hose to the side.
3. Remove the thermostat –4– and the sealing ring –3–. To do this, turn the thermostat 90° (1/4 turn) to the left and remove.
Examination
4. Measure the dimension(s) at the thermostat.
5. Heat the thermostat in water. The thermostat should not touch the walls of the vessel.
6. Check the temperature of the beginning and end of opening with a thermometer for compliance with the requirements of the Specifications
7. After heating the thermostat to a temperature of + 100°C, dimension (b) should be 7 mm larger than dimension (a). The stroke from the beginning to the end of opening the thermostat should be at least 7 mm.
Installation
8. After heating the thermostat to a temperature of + 100°C, dimension (b) should be 7 mm larger than dimension (a). The stroke from the beginning to the end of opening the thermostat should be at least 7 mm.
9. Reinstall the thermostat.
Warning: For 1.8L engine, insert thermostat and turn 90° (1/4 turn) to the right. Installation position: The thermostat mounting clamp should be positioned vertically.
10. Lubricate the new O-ring with coolant and insert.
11. Tighten the connecting pipe with a torque of 15 Nm.
12. Fill the system with coolant.
13. On 1.8 l engine (AGU) with air conditioning: Tighten the air conditioning compressor to 45 Nm and install the ribbed belt.
14. Check the cooling system for leaks.
(The original text of the material can be found on the website «audimanual»)