Connection Diagram - Coolant Hoses, Versions With Parking/Auxiliary Heater

WARNING: This page is about a different car, the 2021 Audi A6 Quattro, 2020 Audi A6 Quattro, and 2019 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Blue = large coolant circuit.
Red = small coolant circuit.
Brown = heating circuit.
Green = coolant circuit for the transmission.
Arrows = coolant flow direction.

Fig 1: Diagram For Coolant Hoses, Audi A6/A7 With Parking/Auxiliary Heater

Courtesy of AUDI OF AMERICA, LLC

Radiator
Cylinder Block
Check Valve
Turbocharger
Check Valve
Exhaust Manifold
Cylinder Head
Engine Coolant Temperature Sensor -G62-
Restrictors
Check Valves
Parking/Auxiliary Heater
- With Recirculation Pump -V55-
Heater Coolant Shut-Off Valve -N279-
Bleed Hole
Heater Core for the Heater
Coolant Pump
Coolant Thermostat
- For transmission coolant circuit
- Equipped on some models
ATF Cooler
- Equipped on some models
After-Run Coolant Pump -V51-
- Equipped on some models
Restrictor
Cap
- Pressure Relief Valve, Checking. Refer to COOLING SYSTEM, CHECKING FOR LEAKS .
Coolant Expansion Tank
Check Valve
Engine Coolant Temperature Sensor on Radiator Outlet -G83-
Engine Temperature Control Actuator -N493-
Engine Oil Cooler