6 Cylinder

Coolant Recirculation Pump (V50) (Water Pump (V36))

• Depending on the version of the Climatronic control module (J255) A/C control head, coolant pump (V50) may be referred to as water pump (V36) in Guided Fault Finding. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function.

• The coolant pump (water pump) versions and activation differ depending on the version of the vehicle and production period. From MY 12 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 100 Hertz signal depending on the engine. Pumps, controlled by a 100 Hertz signal, also have a diagnostic function and are controlled by the engine control module. Check for the correct allocation; refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function, and to the Parts Catalog.

• For vehicles with 6 cylinder FSI (currently not on 6 cylinder TFSI vehicles) and on other engines with certain options (for example, vehicles with "Start/Stop") but without 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 the Vehicle Diagnostic Tester in "Guided Fault Finding" function.

• For vehicles with 6 cylinder the coolant recirculation pump (water pump) - A - is installed 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.






• When the coolant pump (water pump) is running, the coolant flows from the engine through the coolant hose - B - and through the coolant hose - C - to the heater core inside the air conditioner (note the flow direction - arrows -).

• As of MY 09, the coolant pump (water pump ) is controlled directly by the Climatronic control module (J255) depending on the date of manufacture and via the recirculation pump relay (J160) (by the same output like the Climatronic refrigerant shut-off valve (N422) ). Refer to and the Vehicle Diagnostic Tester in "Guided Fault Finding" function.

• On vehicles with a recirculation pump relay (J160) (for example, MY 08 vehicles) the coolant pump (water pump) is always activated when the ignition is turned on, when the Climatronic refrigerant shut-off valve (N422) is not on (for example, when the temperature is set to "warm" on the Climatronic control module). Refer to and => [ Coolant Recirculation Pump (V50) (Water Pump (V36)) ].

• On vehicles without a recirculation pump relay (J160) (running change in MY 09), the coolant pump (water pump) is controlled by the setting on the Climatronic control module, depending on the coolant temperature with the ignition turned on. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function.

• The coolant pump (water pump) is controlled not only when the "Stop Function" is active (option, running change in MY 10) but also, with the engine running, when the temperature setting is set to "warm" on the Climatronic control module ("HI" appears in the A/C control head display and in the MMI). The coolant pump is activated to support the engine coolant pump. Check using the Vehicle Diagnostic Tester in "Guided Fault Finding" function.

• If the vehicle has a coolant pump (water pump) and a Climatronic refrigerant shut-off valve / coolant shut-off valve that are activated directly by the Climatronic control module, then the Climatronic control module will store any faults on these components. Pay attention to the version, the coding and the adaptation on the Climatronic control module using the Vehicle Diagnostic Tester in "Guided Fault Finding" function.