Coolant Shut-Off Valve -N82- /Climatronic Coolant Shut-Off Valve -N422- LOCATION, ACTIVATION AND FUNCTION
Climatronic Coolant Shut-Off Valve -N422- /Coolant Shut-Off Valve -N82-
On certain vehicles (depending on the engine), vacuum-controlled coolant Shut-Off valves -A- were installed on vehicles without a "parking heater" from start of production. Electrically controlled Shut-Off valves -B- were introduced later as a running change. These valves may be referred to as a Climatronic Coolant Shut-Off Valve -N422- or a Coolant Shut-Off Valve -N82- depending on the engine version and on the time of production. Refer to appropriate SYSTEM WIRING DIAGRAM and using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.
Pay attention to the flow direction of the coolant -arrow- when installing.
This valve is referred to as a Climatronic Coolant Shut-Off Valve -N422- or a Coolant Shut-Off Valve -N82- depending on the engine version and on the time of production. Refer to appropriate SYSTEM WIRING DIAGRAM and using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.
The activation of the Climatronic Coolant Shut-Off Valve -N422- /Coolant Shut-Off Valve -N82- varies, depending on the vehicle version and on the period of production (either by the Climatronic Control Module -J255- A/C display and control head or by the respective engine control module). Refer to appropriate SYSTEM WIRING DIAGRAM.
On vehicles with an engine with a regulated coolant circuit (for example, with a regulated coolant pump and a Cylinder Head Coolant Valve -N489-), no Climatronic Coolant Shut-Off Valve -N422- /Coolant Shut-Off Valve -N82- is currently installed. On an engine with a regulated coolant pump, the engine control module activates the coolant pump, and in doing so regulates the coolant circuit. Refer to COOLANT PUMP/THERMOSTAT for 2.0L, COOLANT PUMP/THERMOSTAT for 3.0L, or COOLANT PUMP/THERMOSTAT for 3.2L .
Information regarding a coolant Shut-Off valve activated by vacuum
The component location and the version of the Climatronic Coolant Shut-Off Valve -N422- -B- and of the coolant Shut-Off valve -A- depends on the engine, on the vehicle version and the vehicle build date.
- This illustration shows the location and version of the Climatronic Coolant Shut-Off Valve -N422- -B- on a 6-Cylinder FSI engine as installed at the start of production. Version "1" of the Climatronic Coolant Shut-Off Valve -N422- -B- is installed near the cylinder head.
- The Climatronic Coolant Shut-Off Valve -N422- -B- is installed in the plenum chamber on certain vehicles (such as the Audi Q5 with a 6-Cylinder diesel engine). This illustration shows version "2" of the Climatronic Coolant Shut-Off Valve -N422-.
- The Climatronic Coolant Shut-Off Valve -N422- was installed only on vehicles with a 6-Cylinder FSI engine at start of production, for example. It was introduced on other engines as a running change in MY 2008. The exact introduction depends on the vehicle equipment and build date. Refer to COOLANT PUMP/THERMOSTAT for 2.0L, COOLANT PUMP/THERMOSTAT for 3.0L, or COOLANT PUMP/THERMOSTAT for 3.2L .
When installing the Climatronic Coolant Shut-Off Valve -N422- -B-, ensure the proper connection of the vacuum hoses.
- On version "1" the vacuum hose to the Shut-Off valve -A- is connected to connection "3" -C-. The vacuum supply from the engine comes from the connection "2" -D-.
- On version "2" the vacuum hose -C- to the Shut-Off valve -A- is connected to connection "3". The vacuum supply from the engine comes from the connection "2" -D-.
- The illustration shows the allocation on a MY 2009 4-Cylinder diesel engine.
- The ventilation of the Shut-Off valve vacuum diaphragm -A- after the end of activation, for example, on version "2" of the Climatronic Coolant Shut-Off Valve -N422- -B- occurs via the connection "1" under the cap -E-.
- The vacuum hose -C- (leading to the Shut-Off valve -A-) is identified with a white mark, depending on the version.
- Pay attention to the correct allocation of the vacuum hoses on the Climatronic Coolant Shut-Off Valve -N422- -B-
- If the vacuum hoses are interchanged, there may be no heating in the passenger compartment.
- The Climatronic Coolant Shut-Off Valve -N422- -B- is briefly activated, for example, by the Climatronic Control Module -J255- A/C display and control head to check function (without the function being required) in certain intervals (for example, after 20 engine starts). If the vacuum hoses are incorrectly connected to the Climatronic Coolant Shut-Off Valve -N422- -B-, then the coolant Shut-Off valve -A- is activated briefly. If the hoses are interchanged, the vacuum will remain in the vacuum hose vacuum diaphragm -A- for an undetermined amount of time after the activation is completed. The Shut-Off valve -A- will not open. Coolant will flow into the heat exchanger and the A/C system will not heat when the Shut-Off valve -A- is closed.
- If the vacuum hoses are connected incorrectly, the engine will continue to take in some fresh air via the connection "1" on the Climatronic Coolant Shut-Off Valve -N422-. This can lead to additional problems in the engine idle RPM which will be entered in the engine control module data memory.
Information for all
- An electric Shut-Off valve -B- or a vacuum-controlled coolant Shut-Off valve -A- is installed either in the plenum chamber or in the engine compartment depending on the engine and the vehicle version.
- The Climatronic Coolant Shut-Off Valve -N422- /Coolant Shut-Off Valve -N82- is then only activated, for example, via the A/C system controls (either directly or via the engine control module) when the A/C system is set to "OFF". The engine RPM must be lower than 5, 000 and the coolant temperature must be below 90 °C (194 °F). Shutting off the coolant circuit to the A/C heater core accelerates the engine warming up when the coolant is cold.
- If the vehicle, for example, has a parking heater as an option, then the vehicle does not have a Climatronic Coolant Shut-Off Valve -N422- /Coolant Shut-Off Valve -N82- -B- or a Shut-Off valve -A-. For vehicles with a parking heater, the installed Heater Coolant Shut-Off Valve -N279- performs this function.
- The Climatronic Coolant Shut-Off Valve -N422- activation can be switched off via the "adaptation" function for the A/C system using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.
- Vehicles with a 6-Cylinder FSI engine (currently not on the 6-Cylinder TFSI engine) and on other engines with certain optional equipment (for example, vehicles with the Start/Stop System) but without a "parking heater" also have a Coolant Recirculation Pump -V50- (Water Pump -V36-) installed. Refer to COOLANT PUMP/THERMOSTAT for 2.0L, COOLANT PUMP/THERMOSTAT for 3.0L, or COOLANT PUMP/THERMOSTAT for 3.2L . For an illustration of the pump and additional information. 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.
- 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. Activation takes place after the Climatronic Control Module -J255- makes the request via the engine control module on certain vehicles (Audi Q5 Hybrid). Pay attention to the correct version of the Climatronic Control Module -J255- A/C display and control head and the correct coding and adaptation using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function and, refer to appropriate SYSTEM WIRING DIAGRAM.
- 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- /Coolant Shut-Off Valve -N82- is not activated (for example, with the temperature preset "warm" on the Climatronic Control Module -J255- A/C display and control head). Refer to Coolant Recirculation Pump -V50- (Water Pump -V36-), LOCATION, ACTIVATION AND FUNCTION, VEHICLES WITH 6-CYLINDER GASOLINE ENGINE and to the appropriate SYSTEM WIRING DIAGRAM.
- For vehicles without a Recirculation Pump Relay -J160- (gradual introduction 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. For certain vehicles (for example, on the Audi Q5 hybrid) activation takes place after the Climatronic Control Module -J255- makes the request via the engine control module. Refer to Coolant Recirculation Pump -V50- (Water Pump -V36-), LOCATION, ACTIVATION AND FUNCTION, VEHICLES WITH 6-CYLINDER GASOLINE ENGINE and, refer to appropriate SYSTEM WIRING DIAGRAM.
- The Coolant Recirculation Pump -V50- (Water Pump -V36-) and the Climatronic Coolant Shut-Off Valve -N422- activation depends on the vehicle equipment level and the vehicle date of manufacture using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function and, refer to appropriate SYSTEM WIRING DIAGRAM.
- 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.
- 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 appropriate SYSTEM WIRING DIAGRAM .