audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

ABOUT US
Components for control and regulation of air conditioner located in passenger compartment > < Dismantling and assembling air conditioning unit

A5

Coolant circulation pumpV50 (coolant pumpV36) on vehicles with a 4-cyl. engine
Coolant circulation pump -V50- (coolant pump -V36-) on vehicles with a 4-cyl. engine
  Note
t  Depending on the version of the air conditioner operating and display unit, Climatronic control unit -J255-, the coolant circulation pump -V50- may also be referred to as coolant pump -V36- in the guided fault-finding routine → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
t  The design of the coolant circulation pump -V50- (coolant pump -V36-) and pump actuation differ depending on the vehicle model and production period. As of Model Year 2012 and depending on the engine, the pumps fitted as of the start of production and actuated by way of a 500 hertz signal (500 pulses per second) are gradually being replaced by pumps actuated by way of a 100 hertz signal. The pumps actuated by way of a 100 hertz signal additionally feature a diagnostic function and are generally actuated by way of the corresponding engine control unit. Attention is therefore to be paid to correct assignment (only the assigned pump can ever be actuated) → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051, → Current flow diagrams, Electrical fault finding and Fitting locations and → Electronic parts catalogue.
t  On vehicles with a 4-cyl. engine and a „start/stop system“ as optional extra but no „auxiliary heater“ optional extra are fitted with -V50- (-V36-) → Engine, mechanics; Rep. gr.19. Actuation of -V50- (-V36-) depends on the vehicle equipment and production period → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051. and → Current flow diagrams, Electrical fault finding and Fitting locations.
   
t  On vehicles with a 4-cyl. engine and a „start/stop system“ as optional extra but with no „auxiliary heater“ optional extra, the coolant circulation pump -V50- (-V36-) -A- is fitted for example in the area between the engine and the front wall of the plenum chamber → Engine, mechanics; Rep. gr.19.
t  This illustration shows the layout on an Audi A4 with a 4-cyl. TFSI engine from Model Year 2010. Depending on the engine, vehicle model and production period, the coolant circulation pump -V50- (coolant pump -V36-) -A- may also be fitted at a different location (e.g. in the plenum chamber) → Engine, mechanics; Rep. gr.19.
t  With -V50- (-V36-) in operation, the coolant is drawn in via the coolant hose -B- (from the engine through the heat exchanger of the air conditioning unit and the coolant shut-off valve -D-) and returned to the engine via the coolant hose -C- (pay attention to direction of flow -arrows-).
t  When the ignition is switched on, -V50- (-V36-) may be actuated directly by the air conditioner operating and display unit, Climatronic control unit -J255- depending on the coolant temperature and the setting made → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051 and → Current flow diagrams, Electrical fault finding and Fitting locations.
t  Depending on the vehicle model, -V50- (-V36-) is actuated not only with the „Stop function“ active but also with the engine running e.g. with „warm“ temperature setting on the air conditioner operating and display unit, Climatronic control unit -J255- („HI“ display on air conditioner operating and display unit and Multi Media Interface). The coolant circulation pump -V50- is then actuated to assist the engine coolant pump → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
t  On vehicles with a „Start/stop system“, -V50- (-V36-) and the Climatronic coolant shut-off valve -N422- are actuated directly by the air conditioner operating and display unit, Climatronic control unit -J255-. If faults are stored for these components in the air conditioner operating and display unit, Climatronic control unit -J255-, attention must therefore be paid to the version, encoding and adaption of -J255- → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
t  Vehicles with an „auxiliary heater“ as optional extra are not fitted with a Climatronic coolant shut-off valve -N422- or -V50- (or -V36-). On these vehicles, this function is assumed by the components of the auxiliary heater (heater coolant shut-off valve -N279- and circulation pump -V55-) → Auxiliary heater; Rep. gr.82.
  A87-10638

Components for control and regulation of air conditioner located in passenger compartment > < Dismantling and assembling air conditioning unit