Connection Diagram - Coolant Hoses
WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2017 Audi S5, 2016 Audi S5, 2016 Audi S4, 2015 Audi S5, and 2015 Audi S4. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Risk of scalding due to hot steam and hot coolant.
- The coolant system is under pressure when the engine is warm.
- Cover the coolant reservoir cap with a cloth and then open it slowly to release the pressure.
There is a risk of injury if the radiator fan turns on by itself.
- Disconnect the connectors before working near the fan shroud.
NOTE:
Secure all hose connections with hose clamps of the same type as those equipped by the factory.
The arrows on the coolant pipes and ends of coolant hoses must align.
NOTE:
Blue = large coolant circuit.
Red = small coolant circuit.
Orange = coolant circuit for the charge air cooler.
Brown = heating circuit.
The arrows show the coolant flow direction.
A5 through MY 2011, A4 through MY 2012 without Parking Heater
- Front Charge Air Cooling Circuit Radiator
- Change the coolant after replacing
- Radiator
- Vehicles with a S tronic transmission: with integrated ATF cooler
- Change the coolant after replacing
- Engine Coolant Temperature Sensor -G62-
- Coolant Thermostat
- Coolant Pump
- Right Charge Air Cooler
- Inside the supercharger housing
- Change the coolant after replacing
- Coolant Shut-Off Valve
- Is activated by the Climatronic Refrigerant Shut-Off Valve -N422-
- The Climatronic Refrigerant Shut-Off Valve -N422- is activated by the Climatronic Control Module -J255-.
- Removing and installing. Refer to Coolant Shut-Off Valve -N82- /Climatronic Coolant Shut-Off Valve -N422- LOCATION, ACTIVATION AND FUNCTION
- Bleed Screw
- Cylinder Head Bank 1 (Right)
- Change the coolant after replacing
- Heater Core for Heater
- Removing and installing. Refer to HEATER CORE, REMOVING AND INSTALLING .
- Change the coolant after replacing
- Bleeder Hole
- Cylinder Head Bank 2 (Left)
- Change the coolant after replacing
- Bleeder Screw
- Left Charge Air Cooler
- Inside the compressor housing
- Change the coolant after replacing
- Coolant Reservoir Cap
- Checking the pressure relief valve. Refer to PRESSURE RELIEF VALVE IN CAP, CHECKING .
- Coolant Expansion Tank
- Engine Oil Cooler
- After-Run Coolant Pump -V51-
- Market-specific
- Check Valve
- Inside the coolant hose
- Charge Air Cooling Pump -V188-
- Left Charge Air Cooling Circuit Radiator
- Change the coolant after replacing
- Check Valve
- Inside the coolant hose
- Check Valve
- Inside the coolant hose
A5 through MY 2011, A4 through MY 2012 with Parking Heater
- Front Charge Air Cooling Circuit Radiator
- Change the coolant after replacing
- Radiator
- Vehicles with a S tronic transmission: with integrated ATF cooler
- Change the coolant after replacing
- Engine Coolant Temperature Sensor -G62-
- Parking Heater
- With Recirculation Pump -V55-
- Removing and installing. Refer to Auxiliary Heater Heating Element -Z35-, REMOVING AND INSTALLING .
- Coolant Thermostat
- Coolant Pump
- Right Charge Air Cooler
- Inside the compressor housing
- Change the coolant after replacing
- Bleeder Screw
- Climatronic Refrigerant Shut-Off Valve -N422-
- Removing and installing. Refer to Coolant Shut-Off Valve -N82- /Climatronic Coolant Shut-Off Valve -N422- LOCATION, ACTIVATION AND FUNCTION
- Activated via the Climatronic Control Module -J255-
- Cylinder Head Bank 1 (Right)
- Change the coolant after replacing
- Heater Core for Heater
- Removing and installing. Refer to HEATER CORE, REMOVING AND INSTALLING .
- Change the coolant after replacing
- Bleeder Hole
- Cylinder Head Bank 2 (Left)
- Change the coolant after replacing
- Bleeder Screw
- Left Charge Air Cooler
- Inside the compressor housing
- Change the coolant after replacing
- Coolant Reservoir Cap
- Checking the pressure relief valve. Refer to PRESSURE RELIEF VALVE IN CAP, CHECKING .
- Coolant Expansion Tank
- Engine Oil Cooler
- After-Run Coolant Pump -V51-
- Market-specific
- Check Valve
- Inside the coolant hose
- Charge Air Cooling Pump -V188-
- Left Charge Air Cooling Circuit Radiator
- Change the coolant after replacing
- Check Valve
- Inside the coolant hose
- Check Valve
- Inside the coolant hose
A5 from MY 2012, A4 from MY 2013 without Parking Heater
- Front Charge Air Cooling Circuit Radiator
- Change the coolant after replacing
- Radiator
- With ATF cooler
- Change the coolant after replacing
- Engine Coolant Temperature Sensor -G62-
- Coolant Thermostat
- Coolant Pump
- Right Charge Air Cooler
- Inside the compressor housing
- Change the coolant after replacing
- Bleed Screw
- Cylinder Head
- Cylinder bank 1 (right)
- Change the coolant after replacing
- Bleed Screw
- Heater Core for Heater
- Removing and installing. Refer to HEATER CORE, REMOVING AND INSTALLING .
- Change the coolant after replacing
- Coolant Recirculation Pump -V50-
- Removing and installing. Refer to Coolant Recirculation Pump -V50- (Water Pump -V36-), LOCATION, ACTIVATION AND FUNCTION, VEHICLES WITH 6-CYLINDER GASOLINE ENGINE
- Engine Temperature Control Sensor -G694-
- Cylinder Head
- Cylinder bank 2 (left)
- Change the coolant after replacing
- Bleeder Screw
- Left Charge Air Cooler
- Inside the compressor housing
- Change the coolant after replacing
- Cap
- Checking the pressure relief valve. Refer to PRESSURE RELIEF VALVE IN CAP, CHECKING .
- Coolant Expansion Tank
- Engine Oil Cooler
- Change the coolant after replacing
- Check Valve
- Inside the coolant hose
- Check Valve
- Inside the coolant hose
- Check Valve
- Inside the coolant hose
- Left Charge Air Cooling Circuit Radiator
- Equipment may differ depending on version
- Change the coolant after replacing
- Charge Air Cooling Pump -V188-
A5 from MY 2012, A4 from MY 2013 with Parking Heater
- Front Charge Air Cooling Circuit Radiator
- Change the coolant after replacing
- Radiator
- with ATF cooler
- Change the coolant after replacing
- Engine Coolant Temperature Sensor -G62-
- Coolant Thermostat
- Parking Heater
- With Recirculation Pump -V55-
- Removing and installing. Refer to Auxiliary Heater Heating Element -Z35-, REMOVING AND INSTALLING .
- Coolant Pump
- Right Charge Air Cooler
- Inside the compressor housing
- Change the coolant after replacing
- Bleed Screw
- Cylinder Head
- Cylinder bank 1 (right)
- Change the coolant after replacing
- Heater Coolant Shut-Off Valve -N279-
- Bleeder Screw
- Heater Core for Heater
- Removing and installing. Refer to HEATER CORE, REMOVING AND INSTALLING .
- Change the coolant after replacing
- Engine Temperature Control Sensor -G694-
- Cylinder Head
- Cylinder bank 2 (left)
- Change the coolant after replacing
- Bleeder Screw
- Left Charge Air Cooler
- Inside the supercharger housing
- Change the coolant after replacing
- Cap
- Checking the pressure relief valve. Refer to PRESSURE RELIEF VALVE IN CAP, CHECKING .
- Coolant Expansion Tank
- Engine Oil Cooler
- Change the coolant after replacing
- Check Valve
- Inside the coolant hose
- Check Valve
- Inside the coolant hose
- Check Valve
- Inside the coolant hose
- Left Charge Air Cooling Circuit Radiator
- Equipment may differ depending on version
- Change the coolant after replacing
- Charge Air Cooling Pump -V188-