Quote:
Originally Posted by btimbit
Rad flush would be super easy, if you can change your oil you can flush your coolant. Just drain it, fill it with water, run the vehicle with the coolant cap off to purge air out and the heat on full to flush the heater core for about half an hour. Then drain out the water, fill with new coolant, run for half an hour once more, again with the coolant cap off and the heater on, then after half an hour double check your level, check for leaks, put the cap back on and you're good to go. Easy peasy.
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There is some critical info left out here. Never flush with tap water it must be distilled or de-oionized this is because it is not possible to drain out all the water from the engine. Also if you flush with pure water you will have an issue if you are using premixed coolant the water still in the engine will dilute the mixture and could pose a problem in cold weather.
The correct way to flush is use any available drains on the engine block but even doing this will still leave some water in the engine so you'll need to add premix then drain then fill the system. If you are using concentrated coolant that requires water added then you will need to calculate how much water is still in the engine, and/or use a hydrometer. Depending on the car compressed air can be used to force out any remaining fluid but not always practical depending on the car.
For doing coolant drains/fills the Lisle Spill Free Funnel will save you time and coolant spilling all over the place Princess Auto usually has it also check KMS Tools.