Express 4500 V8-6.0L (2010)
1. Inspect the drained coolant for sand or other debris, flush the system as needed. Refer to Flushing (See: Service and Repair/Procedures/Flushing).
2. Inspect and clear the radiator vent hose fitting, if necessary.
There is a small 2.0 mm (0.080 in) orifice (vent hose fitting) in the neck of the radiator where the coolant vent hose from the engine attaches to the
radiator.
3. Position the water pump (300) and NEW gaskets (306) to the engine block.
Caution: Refer to Fastener Caution (See: Service Precautions/Vehicle Damage Warnings/Fastener Caution).
4. Install the water pump bolts (301).
1. Tighten the bolts a first pass to 15 Nm (11 lb ft).
2. Tighten the bolts a final pass to 30 Nm (22 lb ft).
5. Position and install the heater inlet hose (2) to the water pump.
6. Position the heater inlet hose clamp (1) at the water pump.
