On vehicles with an auxiliary alarm system, the expansion tank contains a vehicle pitch sensor that illuminates the warning light if the coolant level drops significantly.
When starting a cold engine, coolant circulates around the cylinder block, head (OK) cylinder block and exhaust manifold. Warm coolant flows through the automatic choke housing (in the presence of) and through the heater before returning to the engine.
As the coolant expands, the level of the expansion tank rises. The flow of coolant through the radiator is closed, which provides a closed thermostat. When the coolant reaches a predetermined temperature, the thermostat opens and hot coolant flows through the top hose to the radiator. As the coolant passes down through the radiator, it is cooled by the flow of oncoming air. Coolant circulation continues through the expansion tank, exhaust manifold and heater constantly.
The hydraulic fan clutch is controlled by the air temperature behind the radiator. When the air temperature reaches a predetermined level, the bimetal coil opens the valve and the silicon fluid flows through the clutch vane system. The leading part of the clutch is located on the same shaft as the water pump, the driven part of the clutch is connected to the fan blades. The clutch blades are designed so that the torque is transmitted to the fan blades depending on the viscosity of the fluid, which in turn depends on the ambient temperature and engine speed. Therefore, the fan operates only when required and, compared to a constantly running fan, significantly saves fuel, reduces wear on the drive belt and reduces fan noise.
Radiator and expansion tank
The crossflow radiator has tanks made of artificial material. The expansion tank is made of transparent material and is marked with maximum and minimum coolant levels. In vehicles equipped with an automatic transmission, an automatic transmission oil cooler is located in the right radiator tank (oil coolant type).
Expansion tank with overpressure valve that effectively seals the cooling system both when the coolant temperature rises and when it falls. The expansion tank also has a degassing function. Any accumulation of air bubbles in the coolant, thermostat housing and radiator is returned to the expansion tank and vented to the atmosphere, thus maintaining the efficiency of the coolant.
On vehicles with an auxiliary alarm system, the expansion tank contains a vehicle pitch sensor that illuminates the warning light if the coolant level drops significantly.
| Opening pressure of the overpressure valve in the plug of the expansion tank: | |
| – OHC and DOHC engine | 85 - 110 kPa |
| – V6 engine | 100 - 140 kPa |
Coolant pump
The centrifugal coolant pump, located on the front wall of the cylinder block, is driven by a V-belt together with the generator.
V-belt
| Brand and type | Motorcraft 83 HF 6 C 301 AA |
| Tension (measured with special tool Ford): | |
| - new belt | 400 - 500 N |
| - used belt | 300 - 400 N |
| Deflection | 10mm in the middle of the longer thumb pressure area |
Fan
The OHC engine fan is made of artificial material, has seven blades, is located on the coolant pump shaft and is driven by a V-belt along with the pump and alternator.
DOHC engine fan electrically driven by a temperature sensor located in the radiator drain plug.
Thermostat
The thermostat is located behind the water outlet on the front of the cylinder head on OHC models and on the front of the water pump on V6 models.
| Opening start temperature: | |
| – OHC and DOHC engine | 85 - 89°С |
| – V6 engine | 79 - 83°С |
| Rated opening temperature | 88°C |
| Full opening temperature | 102±3°С |
Coolant
| Quantity: | |
| – OHC engine | 8.0 dm3 |
| – DOHC engine with carburetor | 7.9 dm3 |
| – DOHC engine with injection system | 7.3 dm3 |
| – V6 engine | 8.5 dm3 |
| Type | mixture of special antifreeze liquid Ford SSM 97 B 9103 A and distilled water (by 50%) form protection up to -30°С |
| coolant density | 1.069 – 1.077 g/cm3 |
| Replacement frequency | every 60,000 km or every two years |
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