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Fuel supply, gas operation > < Coolant regulator housing - Summary of components for engines with identification characters AVU, BFQ

Octavia Mk1

Checking proper operation of thermostat for map-controlled engine coolingF265 on engines with identification characters AVU, BFQ
Checking proper operation of thermostat for map-controlled engine cooling -F265- on engines with identification characters AVU, BFQ
Special tools and workshop equipment required
t  Measuring tool set, e.g. -V.A.G 1594 C-
t  12 V battery
Condition
l  The engine must be cold.
  Note
t  Drain coolant → Chapter.
t  Always replace seals and gasket rings.
t  Top up coolant → Chapter.
–  Remove thermostat for map-controlled engine cooling -F265-.
   
–  Check thermostat when cold.
The large valve disc must provide a proper seal to the connection flange over the entire circumference.
If this is not the case:
–  Replace thermostat for map-controlled engine cooling -F265-.
  N19-0283
–  Connect the contacts of the thermostat for map-controlled engine cooling -F265- to the battery with the adapter cables from the -V.A.G 1594 C-.
–  Use pliers to carefully place the thermostat 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 thermostat for map-controlled engine cooling -F265-.
–  Delete the contents of the fault memory for the engine control unit at the end as error messages were stored due to disconnecting the plugs → Vehicle diagnostic tester.
  N19-0282

Fuel supply, gas operation > < Coolant regulator housing - Summary of components for engines with identification characters AVU, BFQ