Coolant RECIRCULATION Pump -V50- (Water Pump -V36-), Location, Activation And Function, Vehicles With 4- Or 6-Cylinder Engine

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Location for vehicles with a 4-Cylinder engine and for certain vehicles with a 6-Cylinder engine

NOTE:

The Coolant Recirculation Pump -V50- can be installed in different locations. For most vehicles with a 4-Cylinder engine and for certain vehicles with a 6-Cylinder engine, it is located between the plenum chamber bulkhead and the engine. The installed location on vehicles with a 6-Cylinder engine. Refer to COOLANT RECIRCULATION PUMP -V50- (WATER PUMP -V36-), LOCATION, ACTIVATION AND FUNCTION, VEHICLES WITH 6-CYLINDER GASOLINE 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 as a running change, the pumps installed from the start of production, which were activated via a 500 Hertz signal (500 pulses per second), are being replaced by pumps that are activated 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.

The Coolant Recirculation Pump -V50- can be installed in different locations. For vehicles with a high voltage system (hybrid vehicles) it is located between the plenum chamber bulkhead and the engine.

The activation of the Coolant Recirculation Pump -V50- varies. For vehicles with a high voltage system (hybrid vehicles), the activation occurs after the Climatronic Control Module -J255- makes the request via the engine control module. Refer to Wiring Diagram.

For vehicles with a 4-Cylinder engine and the "Start/Stop System", but without a "parking heater", a Coolant Recirculation Pump -V50- (Water Pump -V36-) is 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.
For vehicles with a 4-Cylinder engine and the "Start/Stop System", but without a "parking heater", the Coolant Recirculation Pump -V50- (Water Pump -V36-) -A-, for example, is installed in the area between the engine and the plenum chamber front wall. Refer to OVERVIEW - COOLANT PUMP/THERMOSTAT [CALA] / OVERVIEW - COOLANT PUMP/COOLANT THERMOSTAT [CAEB, CAED, CPMA, CPMB] .

Fig 1: Identifying Coolant Pump
Courtesy of AUDI OF AMERICA, LLC
This illustration shows the location on an Audi A4 with a 4-Cylinder TFSI engine from the MY 2010. The Coolant Recirculation Pump -V50- (Water Pump -V36-) -A- can also be installed in a different location (for example, in the plenum chamber) depending on the engine, vehicle model and date of manufacture. 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 working, the coolant is drawn through the coolant hose -B- (from the engine through the A/C heater core and coolant Shut-Off valve -D-) and then back to the engine through the coolant hose -C- (note the flow direction -arrows-).
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, 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.
The Climatronic Control Module -J255- A/C display and control head or the respective engine control model directly activates the Coolant Recirculation Pump -V50- (Water Pump -V36-) and the Climatronic Coolant Shut-Off Valve -N422- /Coolant Shut-Off Valve -N82- on vehicles with the "Start/Stop System". If any faults on these components are stored in the Climatronic Control Module -J255- A/C display and control head, check the version, coding and 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-).