I recommend this procedure, starting with a cold engine: Remove the radiator cap, remove the thermostat, re-install the thermostat housing, leave the radiator cap off, start engine and idle for not less than fifteen minutes, then turn engine off. Allow engine and radiator to cool completely, then open the petcock at the bottom of the radiator, and drain completely (there will still be some coolant/water in the system).
Remove the thermostat housing again, then remove the old water pump and install a new water pump, replace the thermostat with a new one rated at 195 degrees, and be sure to install it in the proper direction. Fill radiator with water only (you don't want to waste money on antifreeze until you are sure you have heat), leave radiator cap off, start engine and let it come to operating temperature, not less than fifteen minutes. Turn engine off, and let cool compltely. Fill radiator with water only, install radiator cap, and restart vehicle. Let come to operating temperature again, not less than fifteen minutes, turn off. Let cool completely, drain radiator again if your truck got proper heat in cabin, then refill with the proper mixture of water/antifreeze. This sounds like a lot of repetition, but this will flush your entire system, boost your water pressure, and properly regulate your engine temperature. If the problem repeats in your two month window, have the radiator professionally serviced and the heater core will probably have to be replaced.
Always use the proper type and amount of anitfreeze!
Jan 28, 2010 |
2000 Chevrolet Silverado