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COOLANT PUMP - ENGINE CODE(S): CAEB Audi A4 B8

Air Conditioning (avant) 1 illustration ~459 words

COOLANT PUMP - ENGINE CODE(S): CAEB

Note. Depending on the version of the Climatronic Control Module -J255-, Coolant Pump -V50- may be referred to as Water Pump -V36- in Guided Fault Finding. Refer to Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.

Scheme 342

Scheme 342: COOLANT PUMP - ENGINE CODE(S): CAEB
Scheme 342: COOLANT PUMP - ENGINE CODE(S): CAEB
  1. Only on 4 cylinder vehicles with the Start/Stop System, but not having an auxiliary heater, have a coolant pump (water pump). The coolant pump (water pump) activation depends on the vehicle equipment level and the vehicle date of manufacture. Refer to Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding"
  2. Only on 4 cylinder vehicles the coolant pump (water pump) -A- is installed between the engine and the plenum chamber on 4 cylinder vehicles with the Start/Stop System but without an auxiliary heater. Refer to «Description and Operation»(/audi/a4/b8-2007-2012/remont/cooling-fan/#20l-cooling-system-engine-codes-caeb-avant) .
  3. The illustrations shows the location on a MY 10 Audi A4 with a 4 cylinder TFSI engine. The coolant pump (water pump) -A- can also be installed in a different location (for example, inside the plenum chamber) depending on the engine, vehicle model and date of manufacture. Refer to «Removal and Installation»(/audi/a4/b8-2007-2012/remont/cooling-fan/#20l-cooling-system-engine-codes-caeb-avant) .
  4. When the coolant pump (water pump) is working, the coolant flows through the coolant hose -B- (from the engine through the A/C heat exchanger and coolant shut-off valve -D-) and then back to the engine through the coolant hose -C- (flow direction -arrows-).
  5. The coolant pump (water pump) is controlled directly when the ignition is turned on and depending on the coolant temperature and on the setting on the Climatronic control unit. Refer to Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding"
  6. The coolant pump (water pump) is controlled not only when the Start/Stop System is on, but also when the engine is running and when the temperature is set to warm on the Climatronic control module (HI appears in the display on the A/C control head and in the MMI). The coolant pump is activated to support the engine coolant pump. Check using Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
  7. The coolant pump (water pump) and the Climatronic Refrigerant Shut-Off Valve -N422- are controlled directly by the Climatronic control module on vehicles with the Start/Stop System. If any faults on any of the Climatronic control module components are stored, check the version, coding and adaptation using. Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
  8. If the vehicle has an auxiliary heater, then it will not have a Climatronic refrigerant shut-off valve or a coolant pump (water pump). The auxiliary heater components do this function (the Heater Coolant Shut-Off Valve -N279- and the Recirculation Pump -V55-).