Coolant RECIRCULATION Pump -V50- (Water Pump -V36-), Location, Activation And Function, Vehicles With 6-Cylinder Gasoline Engine
Location On Certain Vehicles With A 6-Cylinder Engine
The Coolant Recirculation Pump -V50- can be installed in different locations. The installed location on vehicles with 6-Cylinder engines can be on the longitudinal member (or between the plenum chamber bulkhead and the engine. Refer to COOLANT RECIRCULATION PUMP -V50- (WATER PUMP -V36-), LOCATION, ACTIVATION AND FUNCTION, VEHICLES WITH 4- OR 6-CYLINDER ENGINE .
Depending on the version of the Climatronic Control Module -J255- A/C display and control head, the Coolant Recirculation Pump -V50- may be referred to as Water Pump -V36- in Guided Fault Finding using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
The Coolant Recirculation Pump -V50- (Water Pump -V36-) version and activation differ depending on the vehicle version and production period. From MY 2012 beginning with start of production, pumps that were controlled by a 500 Hertz signal (500 pulses per second) are being replaced by pumps that are controlled by a variable (100 to 500 Hertz) signal depending on the engine. Pumps that are activated by a variable signal are also equipped with a diagnostic function and are activated mostly via the respective engine control module. Therefore, ensure the correct allocation (only the allocated pump can be activated) using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function. Refer to Wiring Diagram and to the Parts Information.
- 6-Cylinder vehicles with an FSI engine (currently not on 6-Cylinder TFSI engine) and on other engines with certain optional equipment (for example, vehicles with "Start/Stop System") but without a "parking heater") have a Coolant Recirculation Pump -V50- (Water Pump -V36-) installed. Refer to OVERVIEW - COOLANT PUMP/THERMOSTAT [CALA] / OVERVIEW - COOLANT PUMP/COOLANT THERMOSTAT [CAEB, CAED, CPMA, CPMB] . The Coolant Recirculation Pump -V50- (Water Pump -V36-) activation depends on the vehicle equipment level and the vehicle date of manufacture using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function. Refer to Wiring Diagram.
- On vehicles with a 6-Cylinder FSI engine but without a "parking heater", the Coolant Recirculation Pump -V50- (Water Pump -V36-) -A- is installed, for example, in the area between the engine and the right longitudinal member under the right headlamp. The illustration shows the location on an Audi A5 Coupe with a 6-Cylinder FSI engine, on an Audi A5 Sportback, an Audi A4, an Audi Q5, etc. The location of the components may be different on vehicles with a different engine. Refer to OVERVIEW - COOLANT PUMP/THERMOSTAT [CALA] / OVERVIEW - COOLANT PUMP/COOLANT THERMOSTAT [CAEB, CAED, CPMA, CPMB] .
- When the Coolant Recirculation Pump -V50- (Water Pump -V36-) is running, the coolant is drawn in via the coolant hose -B- (from the engine) and is delivered via the coolant hose -C- to the heater core in the A/C unit (note the flow direction -arrows-).
- Depending on the production time period, the Coolant Recirculation Pump -V50- (Water Pump -V36-) is activated via the Recirculation Pump Relay -J160- (via the same output as the Climatronic Coolant Shut-Off Valve -N422-) or, as a running change in MY 2009, directly by the Climatronic Control Module -J255- A/C display and control head. Refer to Wiring Diagram and use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
- If the vehicle has a Recirculation Pump Relay -J160- (for example, MY 2008 vehicles), then the Coolant Recirculation Pump -V50- (Water Pump -V36-) is then always activated when the ignition is turned on, if the Climatronic Coolant Shut-Off Valve -N422- is not activated (for example, with the temperature preset "warm" on the Climatronic Control Module -J255- A/C display and control head). Refer to Wiring Diagram and COOLANT RECIRCULATION PUMP -V50- (WATER PUMP -V36-), LOCATION, ACTIVATION AND FUNCTION, VEHICLES WITH 6-CYLINDER GASOLINE ENGINE .
- On vehicles without a Recirculation Pump Relay -J160- (running change from MY 2009), the Coolant Recirculation Pump -V50- (Water Pump -V36-) is directly activated by the Climatronic Control Module, depending on the coolant temperature and the setting on the Climatronic Control Module -J255- A/C display and control head when the ignition is switched on using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function. Refer to Wiring Diagram.
- Depending on the vehicle version, the Coolant Recirculation Pump -V50- (Water Pump -V36-) is activated not only when the "Stop function" is active (running change as optional equipment from MY 2010), but also when the engine is running (when, for example, the "warm" temperature preset is selected on the Climatronic Control Module -J255- A/C display and control head ("HI" in the display on the A/C display and control head and the display in the MMI). The Coolant Recirculation Pump -V50- is then activated to support the engine coolant pump using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
- If the vehicle has a Coolant Recirculation Pump -V50- (Water Pump -V36-) and a Climatronic Coolant Shut-Off Valve -N422- /Coolant Shut-Off Valve -N82- that are activated directly by the Climatronic Control Module -J255- A/C display and control head, then the Climatronic Control Module -J255- A/C display and control head will store any faults on these components. Therefore pay attention to the version, the coding and the adaptation of the Climatronic Control Module -J255- using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
- For vehicles with the optional equipment "parking heater", there is no Climatronic Refrigerant Shut-Off Valve -N422- /Coolant Shut-Off Valve -N82- and Coolant Recirculation Pump -V50- (Water Pump -V36-) installed. In these vehicles, the parking heater components assume this function (the Heater Coolant Shut-Off Valve -N279- and the Recirculation Pump -V55-).