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On the bottme of the radiator should be a small plug either on the bottem left or right.It is the radiator drain. after you have drained all the fluid refill the radiator and continue flushing water tru it it could take up to 3 times of filling it running it and draining it..
ok your going to think i am crazy but trust me on this one i am a ase certified master heavy truck mechanic.drain the coolant from your vehicle and fill with water add 1cup of cascade dish washing detergent to every 2gallons of water. start your vehicle and drive it until it reaches normal operating temp. then let it idle for 15-30 minutes. allow engine to cool off then drain cooling system again. refill with water (no cascade this time) and repeat until water comes out clear again. refill with correct coolant/water mix. also do not use tap water in final mix as it has all kinds of minerals in it use distilled water this cuts down on deposits forming inside your radiator and cooling passages
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