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Octavia Mk1

Operational test of thermostat for map-controlled engine coolingF265
Operational test of thermostat for map-controlled engine cooling -F265-
–  Remove the thermostat for map-controlled engine cooling -F265-.
  Note
t  How to drain the coolant → Chap. 19-1.
t  Always replace seals and gasket rings.
t  How to fill system with coolant → Chap. 19-1.
   
–  Test the thermostat when cold.
The large valve disc must provide a proper seal to the connection flange all round.
If this is not the case:
–  Replace the thermostat for map-controlled engine cooling -F265-.
  N19-0283
–  Connect the contacts of the thermostat for map-controlled engine cooling -F265- using adapter cables from - V.A.G 1594 A- to the battery.
–  Use a clamp to carefully place it vertically up to the flange in a bowl filled with boiling coolant (mixing ratio: 50 % G12).
  Caution
The metal parts of the thermostat must not be touched otherwise they heat up.
The resistance heater now additionally heats up the wax in the thermostat.
–  Observe whether the minimum stroke of 7 mm -dimension -a- is reached after 10 minutes.
–  If thestroke of 7 mm is reached:
–  Separate the voltage supply to the battery.
  Note
This test must not be carried out on air. Otherwise there is a risk of damaging the expansion element!
If the minimum stroke is not reached:
–  Replace the thermostat for map-controlled engine cooling -F265-.
–  In conclusion, erase the fault memory of the engine control unit as faults have been stored as result of unplugging the connectors → 1.6-ltr./75 kW Engine, Fuel Injection and Ignition System; Rep. Gr.01.
  N19-0282

Fuel supply, gas operation > < Test sequence