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Engine AJ-V8/5HP24
17
Engine Cooling
The cooling system is a low volume, high velocity
system with good warm-up and temperature
profile characteristics.
From the pump, the coolant flows into each bank
of the cylinder block. In each bank, 50% of the
coolant cools the cylinder bores and 50% is
diverted through a bypass gallery. At the rear of
the banks the two flows mix and enter the
cylinder heads. The coolant then flows forwards
to the outlet ports. When the thermostat is
closed, the coolant returns directly to the pump
through the bypass on the thermostat housing.
When the thermostat is open, the coolant returns
to the pump via the vehicle's radiator.
A coolant drain plug is installed on the rear left
side of the cylinder block. On vehicles with the
cold climate package, the cylinder block heater
replaces the drain plug.
Note: Coolant is drained from the right bank of
the cylinder block by removing the
coolant pipe behind the starter motor.
CYLINDER BLOCK DRAIN/HEATER
COOLING SYSTEM DIAGRAM
1. Electronic Throttle
2. EGR Valve
3. A/C Heater Return
4. Coolant Pump
5. Thermostat Housing
6. Vehicle Radiator (Reference)
7. A/C Heater Supply
8. Bleed Outlet
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7
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303-O63
303-028