During the cooling cycle, some of the liquid enters the cabin heater heat exchanger, as well as the throttle body to ensure its operating temperature is stable.
The spring thermostat is located in the casing on the engine. When the engine warms up, the closed thermostat blocks the flow of fluid into the radiator. When the engine reaches operating temperature, the thermostat opens and the fluid enters the radiator, where it is cooled before the next cycle.
The system is hermetically sealed with a spring-loaded lid, which has a safety valve, as well as a vacuum valve through which the system can communicate with the atmosphere. By maintaining a certain pressure in the system, the boiling point of the coolant is reduced. When the pressure reaches a critical value, the cover valve is lifted from the seat, resulting in the release of steam from the system.
When the engine is not warmed up, the liquid from the expansion tank flows into the radiator. When the temperature rises, steam from the radiator enters the tank, producing hot liquid.
The design of the described vehicles provides for the presence of an electric viscous clutch. The clutch/fan is controlled from the PCM unit. The operating cycles are carried out in accordance with the signals from the control system information sensors.
The interior is heated by passing outside air through the heater, which is a small heat exchanger located behind the car's dashboard. The heater is heated by hot liquid from the engine cooling system, and outside air enters the passenger compartment through air ducts. The heating temperature is regulated by mixing the hot air that has passed through the heater with the outside air at the ambient temperature. Mixing occurs when controlling the air duct flaps, as well as when changing the heater fan speed.
The rear part of the passenger compartment is heated by an additional heat exchanger located at the rear of the vehicle.
The vehicles described are equipped with a basic air conditioning system consisting of an evaporator located under the dashboard, a condenser installed in front of the radiator, a filter-dryer in the engine compartment and a belt-driven compressor located in front of the engine. Air conditioning in the rear of the cabin is provided by an additional evaporator located at the rear of the vehicle.
Original version of the article on the website «CHEVYMAN.RU»