Step 4: Preheat Control

Picture of Preheat Control

Prometheus9 years ago
What is shown here is the valve that switches from taking in air from over the exhaust manifold, to simply from under the hood. This is shown in the position it is in when the engine is already hot. The hose on the left with the wire-clamp is the engine's coolant intake; the upper radiator hose. Inside of the fitting this attaches to is the thermostat that blocks coolant flow until the engine is warm enough (usually 180-190°F, depending on season)