Water Pump

Water Pump

The water pump is of a conventional design and is located at the front of the engine. It is driven by the accessory drive belt.

Thermostat

The thermostat allows rapid engine warm-up by redirecting coolant flow through the engine below 88.3°C (190.9°F). The thermostat also assists in keeping the engine operating temperature within predetermined limits. The thermostat starts to open between 88.3 - 92.2°C (190.9 - 198°F) and is fully open at 103.9°C (219°F).

Cold Engine (By-pass Circuit) - When the engine is cold and the thermostat is closed, coolant flows from the water pump through the engine, then returns directly to the water pump.

Warm Engine - When the engine is warm and the thermostat is open, coolant flows from the water pump, through the engine, through the thermostat, into the radiator upper coolant hose, through the radiator and then returns to the water pump via the radiator lower coolant hose.

The heater core is on a parallel circuit and is unaffected by the position of the thermostat.

Radiator

The radiator is of aluminium construction with plastic end tanks. Foam seals are installed to the radiator to prevent the cooling air from by passing the radiator core. The radiator is located by four isolator mountings and supported by the radiator support beam. A coolant drain plug is provided in the lower RH side for the draining of the coolant. The Cooling fan shroud is attached to the radiator.

Cooling Fans

Two variable speed electric cooling fans are housed in the cooling fan pack for the cooling of the radiator. The speed of the electric cooling fans is adjusted by the Powertrain Control Module (PCM).

Coolant Reservoir

A pressurized Coolant Reservoir system is used which continuously removes any air from the cooling system. A continuous vent from the engine and radiator to the coolant expansion tank prevents air locks from forming in the cooling system. No manual bleed points are provided on the system.

The Coolant Reservoir should be full when the coolant system is cold.

In-Vehicle Heating

A hose from the front of the thermostat housing directs coolant to the heater water valve which remains closed below 30°C ± 10°C (86°F ± 50°F). Above this temperature, the heater water valve will open and warm water will be available to the heater water pump. This pump will only run when the temperature is > 10°C (50°F) and will supply warm water to the air conditioning heater matrix. The A/C heater matrix outlet is connected through the return side of the water valve, back to the rear of the engine water pump.

Specifications

The anti-freeze is unique and cannot be mixed with other anti-freeze solutions. The OAT coolant/water mixture has a life of 150,000 miles or 5 years (which ever comes first).

Torque Figures