On a small block Chevy, the heater hose fittings are attached to the intake manifold. There are usually two heater hose fittings on a small block Chevy:
1. Inlet Fitting: The inlet fitting is where the hot coolant enters the heater core. It is typically located on the passenger side of the intake manifold, near the front.
2. Outlet Fitting: The outlet fitting is where the cooled coolant exits the heater core. It is typically located on the driver's side of the intake manifold, near the rear.
The heater hoses, which are typically made of rubber, connect these fittings to the heater core. Hot coolant flows from the engine to the heater core through the inlet fitting and then returns to the engine through the outlet fitting. As the hot coolant flows through the heater core, it transfers heat to the air inside the car, providing warmth for the occupants.
