Originally Posted by wongafet
You guys are wrong. Dexcool although designed to be long lasting has a HUGE flaw in it... upon exposure to regular tap water (for top up etc) all it's lubricating and cooling properties vanish (electrolysis). A dexcool system that has been untouched will last a very very long time, I've heard even life of the vehicle, but so far my record I've seen is 7 years. So to say, your dexcool system probably will not need a flush yet, UNLESS while as a new car at the dealership it was topped off with regular tap water instead of distilled water.
Leave the flushing to the pro's with proper flush machines. Proper additive and cleansing packages should be applied before and after the flush. If you just drain and flush with water, that does more harm than good to your system. Coolant test strips will tell you perfectly the condition of your coolant.
best reply here. very true. if you leave your cooling system sealed and don't touch it, it will last a long time. dexcool is a very good product. it's just misunderstood. I have done hundreds of flushes and haven't ever had a problem with leaking afterwards. I also would recommend not adding anything into the system except for dexcool and water. no aftermarket additives, coolant tabs, etc... that stuff is all garbage and will break down dexcool prematurely. once dexcool starts breaking down it can be very bad for your engine and cooling system parts. electrolysis plays a big part in this problem.
If you want to flush it yourself, best thing to do is just drain out as much as you can. then add new mixed dexcool. not quite a flush, but the best you can do at home. better thing to do is get it flushed with a powerflush machine which will actually cycle out all the old coolant and keep the level perfect, etc.