Blower Motor - Blows air through the heater core. Coolant Recovery System - Provides a reservoir for overflow once coolant heats and expands. When the engine stops and cools down, vacuum draws liquid back into the system radiator. It's also a rust and corrosion inhibitor.
Ethylene glycol or propylene glycol is only the anti-freeze part.
Coolant Temperature Sensor - Sends the temperature of coolant to gages and engine control computer. Fan Clutch - Disconnects the fan when no extra cooling is necessary reducing the burden on the engine. When the car is at idle or being driven in heavy traffic at lower speeds, the fan pulls cool air through the radiator. Hose Clamps - Clamps, generally made of a stainless steel band and a screw housing, are commonly attached around the hose at the fitting to provide a tight seal and prevent leaks. Hoses - Coolant, heater, bypass, fuel line, power steering, air conditioning, emission control and windshield washer hoses serve as flexible connectors for many liquids and gases required for the operation of a vehicle.