Flushing coolant out

VIPR PWR said:

The way I have always known to flush a cooling system it to remove the thermostat and bolt the housing back on .. run the truck for the specified time with the recommended flush chemical.
Drain it , using the radiator petcock , then remove the upper radiator hose from the radiator , remove the radiator cap and put your water hose in it to fill and start the engine .. it will circulate through the entire cooling system and flush out all the chemical flush and garbage unrestricted .. the exit point is the the disconnected upper radiator hose so be sure it pointing in a safe direction to avoid water being sprayed all over you or the engine etc ... add an extension to the hose if you want ... once the water looks clear coming out .. hook the upper hose back on the radiator.. open the petcock and let the rest drain ,, close the petcock and reinstall a new thermostat.. then add the proper coolant, start the engine marking sure you keep topping off the coolant level , you need to at least run it to operating temperature so the thermostat opens .. once all looks good and full .. put the cap back on and bleed the rest of the air from the system using the bleeder screw ..

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Raiiin said:

I use the bottom hose but your way sounds more efficient a little bit

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