Cooling & Hose Map
How Coolant Moves
Coolant runs in a loop: the pump pushes it through the engine, the thermostat decides when it can reach the radiator, and airflow across the radiator carries the heat away.
Coolant flow
Coolant loop
Radiator
Water pump
Engine block
Cylinder heads
Thermostat
Radiator
Cabin heat branch
Engine
Heater hose
Heater core
Return hose
Pump
Expansion
System pressure
Reservoir
Back into the system on cooldown
Hose Map
Every line type is shown separately so they can't be confused
Select a line to see where it runs and what happens if it is left off.
Never open a hot cooling system — pressurised coolant causes serious burns. Coolant specification and system capacity read Verification Required until confirmed; see Fluids.