Thermostat Housing: Testing and Inspection

Map Controlled Engine Cooling Thermostat F265, checking

Special tools, testers and auxiliary items required





^ Connector test set V.A.G 1594C

- Remove Map Controlled Engine Cooling Thermostat F265.

Note:
^ How to drain coolant refer to Cooling draining and filling.
^ Always replace gaskets and seals.
^ How to fill coolant refer to Cooling draining and filling.





- Check thermostat when cold: Large valve plat must seal all around against connection flange.

If this is not the case:

- Replace Map Controlled Engine Cooling Thermostat F265.





- Connect contacts on Map Controlled Engine Cooling Thermostat F265 to battery with adapter leads from Connector Set V.A.G 1594C. Carefully insert it perpendicular to flange in a pot with hot coolant (mixture ratio: 50% G12+) using pliers.

CAUTION: Metal parts of thermostat must not be touched because they get hot. Risk of burning!

The heating element also warms the wax in thermostat.





- Observe whether minimum range of 7 mm - arrows - is reached after 10 minutes. If range of 7 mm is reached:
- Disconnect voltage supply to battery.

Note:
^ This test should not be performed in air. Damage to the expanding material element cannot be prevented!

If minimum range is not achieved:

- Replace Map Controlled Engine Cooling Thermostat F265.