Contents: General information ⇩ Engine cooling system ⇩
| Item name | Spare part catalog number | Description |
| 1 | - | Heater hoses, inlet and outlet |
| 2 | - | Heater hoses, inlet and outlet, for cars with rear heater (installed additionally) |
| 3 | - | Hose between radiator and intake manifold |
| 4 | - | Upper radiator hose |
| 5 | - | Engine Coolant Temperature (ECT) Sensor |
| 6 | - | Water pump |
| 7 | - | Throttle body |
| 8 | - | Intake manifold |
| 9 | - | Throttle Body Coolant Hose |
| 10 | - | Hose between the engine and the expansion tank |
| 11 | - | Expansion tank |
| 12 | - | Lower radiator hose |
| 13 | - | Engine oil cooler (if available) |
| 14 | - | Hose (for models without engine oil cooler) |
| 15 | - | Hoses, inlet and outlet (for models with engine oil cooler) |
| 16 | - | Cooling fan |
| 17 | - | Transmission Fluid Cooler Lines |
| 18 | - | Lower radiator shroud |
| 19 | - | Radiator |
| 20 | - | Upper radiator shroud |
General information
A bypass cooling system is used, providing circulation of coolant through the engine and heater circuit with the main thermostat valve closed. The main purpose of the engine cooling system is to maintain the optimum engine temperature when environmental conditions and engine operating mode change. Other functions of the cooling system include heating the car interior and cooling the working fluid of the gearbox and engine oil.
The cooling system includes the following components:
- Radiator
- Car interior heater core
- Engine Oil Cooler (EOC)
- Coolant pump
- Pressure Regulating Thermostat (PRT)
- Expansion tank
- Fan with viscous coupling
- Connecting hoses and pipelines
(See the source on the website www.lrman.ru)
Engine cooling system
The coolant is circulated through the system by a centrifugal pump mounted at the front of the engine and driven by an additional poly V-belt. The pump pumps the coolant through the cylinder block and cylinder heads through a chamber located in the V of the cylinder block. After passing through the engine, the coolant returns to the thermostat housing through the bypass pipe. Also through the upper hose, coolant is supplied to the heater core. Coolant returns through the EOC to the PRT on the engine side.
The PRT housing contains a conventional thermostat that is positioned so that the temperature of its sensing element is determined by the flow of coolant from both the radiator and the bypass channel. As a result, the opening temperature of the thermostat can vary depending on ambient conditions. The PRT also contains a spring-loaded valve that restricts the flow of fluid through the bypass channel. This means that the engine can temporarily run without fluid flowing through the bypass channel, which in turn improves the operation of the cabin heater.
The horizontal flow radiator has an aluminum alloy core and a drain cock on the lower right rear side. The lower radiator mounts are on the ends of the radiator tanks. The mounts have rubber grommets that are mounted on the top of the vehicle body rails. The top of the radiator is secured with pins that pass through rubber grommets mounted on the front end carrier (FEC) above the radiator. Also built into the radiator are two connections for the transmission fluid cooler lines.
The upper radiator hose is connected to the PRT thermostat via a bypass hose, and the lower hose is directly connected to the thermostat housing outlet pipe.
The expansion tank is installed in front of the left support cup of the suspension in the engine compartment. The expansion tank receives excess amount of working fluid from the cooling system when it expands due to heating and, conversely, when the engine cools down, compensates for its amount when the volume decreases. Air accumulated in the cooling liquid is also discharged through this tank.
The transmission fluid cooler is installed on the side of the cold radiator tank. It is located in the middle of the left radiator tank.
To supply additional air through the radiator core, which is especially important when the vehicle is stationary, a fan with a viscous coupling and an engine drive, located behind the radiator, is used. This fan serves the engine cooling system and the air conditioning cooling system. The fan used has a left-hand rotation.
The speed of the viscous fan is optimally regulated by the ECM to suit all operating conditions.
NOTE: If the electrical connectors are disconnected from the viscous fan, the fan will run at "idle speed" which may cause the engine to overheat. In this case, the ECM will store a corresponding DTC.
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