Hope you don't mind me adding 2 pennies worth caradiodoc !
There are NO drain cock for the engine block. You can drain the coolant the way caradiodoc described or you can struggle under the vehicle and pop out the block PLUGS. Buy new plugs and struggle to put them back in place. (Not advisable). The easiest way is to remove radiator bottom hose from under vehicle. It is very easy to do I have done it hundreds of times. Follow the flushing procedure below or caradiodoc's advice !
Remove radiator cap and open heater control valve to maximum heat position. Open drain cocks or remove plugs in bottom of radiator and engine block. In-line engines usually have one plug or drain cock, while "V" type engines have 2, one in each bank of cylinders.
CAUTION:Some manufacturers use an aluminum and plastic radiator. Flushing solution must be compatible with aluminum.
Connect flushing gun to water outlet of radiator. Disconnect water inlet hose. To prevent flooding engine, use a hose connected to radiator inlet. Use air in short bursts to prevent damage to radiator. Continue flushing until water runs clear.
To flush engine, remove thermostat. Connect flushing gun to water outlet of radiator. Use air in short bursts to prevent damage to radiator. Continue flushing until water runs clear.
To prevent air from being trapped in engine block, engine should be running when refilling cooling system. After system is full, continue running engine until thermostat is open, then recheck fill level. Do not overfill system.
Monday, April 5th, 2010 AT 5:24 AM