Which heater hose is the inlet?

The inlet hose for your heating system is the hose that goes to the water pump area. The other hose is the outlet. These flush kits will actually work on either one though as it does go through the entire cooling system.

What hoses connect to the heater core?

Both the upper and lower radiator hoses are the largest hoses in the cooling system connected to the engine. Heater hoses are smaller hoses that are attached to the heater core, which is located under the dashboard, to supply warmth to passengers in the cabin.

Where are the heater core hoses located?

Heater hoses are rubber hoses that circulate engine coolant to and from the heater core, which is the small radiator that provides heat for the cabin. They typically extend from the engine to the firewall, because the core is located inside the vehicle’s dashboard.

Are both heater core hoses supposed to be hot?

The coolant temperature should hit at least 160°, preferably 180° to 220°. If coolant temperature is acceptable, feel both heater hoses, which should be hot.

Which side of heater core is the inlet?

The water pipe (goes across the top of the engine) is the inlet of the hot coolant for the heater core. The other hose connects to a metal pipe that runs horizontally to the front of the engine.

How often should heater hoses be replaced?

every four years
The upper radiator hose fails more often than any other hose, followed by the water pump bypass hose (if your vehicle is so equipped), and the outlet heater hose from the engine to the heater core. Experts recommend, however, that all hoses be replaced at least every four years or when one fails.

How do I know if my heater core is inlet or outlet?

The water pipe (goes across the top of the engine) is the inlet of the hot coolant for the heater core. The other hose connects to a metal pipe that runs horizontally to the front of the engine. This goes to the inlet side of the pump, through which it returns to the engine. This is the outlet from the heater core.