Doing your own coolant flush is about as effective as peeing into a fan......
The home jobbie consists of dumping in some semi corrosive additive into the cooling system, starting the car up to circulate the stuff...dump everything out, refill with fresh antifreeze and be happy with yourself about a job well done....but this way kinda sux....when you drain the rad, you are only getting about 1/3 of the coolant out of the system, so its not really effective.....
Also, you truly need counter flow to be effective....You need to cut flushing tees into the heater core line, and an adapter for the rad cap or top of the rad. get everything nice and hot (to ensure thermostat is open), hook up to the nice Wynns flush machine....and let 'er rip....
This is especially true on cars that used DEXCOOL, an attempt by GM to make long lasting antifreeze that actually turned to sand when exposed to air...terrible terrible stuff....
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