Cooling System: Description and Operation
COOLING SYSTEM 4.0 LITRECOOLING SYSTEM DESCRIPTION
The cooling system consists of a cross flow radiator matrix, a water pump belt driven by the engine crankshaft, a thermostatic valve to ensure rapid warming up, a header tank and an expansion catchment tank located in the the right-hand front wing.
The radiator is cooled by viscous coupled fan and also an electric driven fan,this fan is thermostatically controlled and it is possible under very hot conditions for it to operate after the engine is switched off. This fan will switch off automatically when the coolant temperature drops below 90°C.
Under cold start conditions, coolant is forced by the water pump through the cylinder block and cylinder head to the thermostat housing. The valve is closed and coolant is therefore returned to the water pump suction inlet (Fig. 1). When the engine operating temperature is reached, the thermostat valve opens allowing coolant to flow around the system (Fig. 2).
ANTI-FREEZE
"Jaguar Anti-freeze / Coolant / Corrosion Inhibitor"
This is a specially formulated anti-freeze which is designed to afford the maximum corrosion protection to all metals found in the engine cooling system, as well as having the frost protection properties necessary during the winter months.
Should this not be available then phosphate free anti-freeze conforming to specification BS 6580 may be used. It is vital that under no circumstances must the solution be allowed to fall below the correct concentration. If this is allowed to happen, then the cooling system could become blocked or damaged.
The coolant solution may remain in the cooling system for TWO YEARS, after which the system should be drained, flushed and refilled with fresh coolant solution.
The correct concentration for all vehicles is 50% with a Specific Gravity of 1.079 (taken from the remote header tank). This mixture is suitable for frost protection down to -36°C (-33°F). Should protection to -40°C (-40°F) be required the concentration must be increased to 55% with a Specific Gravity of 1.086. When topping up the system the correct concentration must be used at all times.
NEVER FILL OR TOP UP THE SYSTEM WITH WATER ONLY.
ADDITIVE
Note: Due to improved design and materials, the additive is not required in vehicles manufactured after VIN 870522.
"Jaguar Radiator Leak Sealer" or "Barrs Leaks" should be added to the coolant mixture; use 1 x 135m1 bottle each time the coolant is changed.
WARNING: DO NOT REMOVE THE HEADER TANK PRESSURE CAP WHILST THE ENGINE IS HOT. IF THE CAP MUST BE REMOVED PROTECT THE HANDS AGAINST ESCAPING STEAM AND SLOWLY TURN THE HEADER TANK CAP SLIGHTLY ANTI-CLOCKWISE UNTIL THE RESISTANCE OF THE SAFETY STOP IS FELT. LEAVE THE CAP IN THIS POSITION TO ALLOW EXCESS PRESSURE TO ESCAPE, THEN PRESS DOWN AND TURN TO REMOVE.
CAUTION: Anti-freeze will damage paint work; avoid spillage.
Fig. 1 Thermostat Closed Condition:
Fig. 2 Thermostat Open Condition:
Key to Figs 1 & 2
1. Radiator
2. Top hose
3. Engine
4. Thermostat housing
5. Water pump
6. Heater
7. Atmospheric catchment tank
8. Headertank
9. Bottom hose