How do you replace a water pump on a 2003 Chevy Express 2500 van?
Drain the water from your 2003 Chevy Express 2500 cooling system. Remove the belt from the water pump. Remove the water return hose. Remove the water pump retaining bolts. Reverse the process to install the new water pump.
The thermostat on a 6 liter 2003 Chevy express is located on the left side of the water pump. The thermostat is a one piece unit attached to the thermostat housing, which is then mounted to the upper left side of the water pump. The average cost for this one piece thermostat/housing is around $25.00.