Elements of the engine cooling system and air conditioning system
1. Radiator; 2. Refrigerator; 3. Radiator and refrigerator cooling fans; 4. Air conditioning compressor 5. Water pump; 6. Expansion tank; 7. Thermostat cover; 8. Air conditioner dehumidifier
Thermostat
1. Flange; 2. Piston; 3. Valve; 4. Main spring; 5. Valve seat; 6. Foundation; 7. Valve; 8. Additional spring
Checking the condition of the coolant
You can use an inexpensive hydrometer to check the condition of the coolant.
Engine cooling system
The engine cooling system is pressurized and the coolant circulation is controlled by a thermostat. Coolant circulation is provided by a water pump located at the front of the cylinder block.
The thermostat housing is located near the radiator on four-cylinder engines and at the top rear of the engine on six-cylinder models.
While the engine is warming up, the thermostat is closed and no coolant enters the radiator. When the engine warms up to normal operating temperature, the thermostat opens and coolant begins to circulate through the radiator.
Heating system
The heating system consists of a blower fan and a heater core that is connected to the engine and through which hot engine coolant circulates.
Air conditioning system
The air conditioning system consists of a refrigerator mounted in front of the engine radiator, an evaporator located next to the heater radiator, a compressor mounted on the engine, a moisture separator in which a high pressure reducing valve is built and pipes connecting the above nodes.