Re: cooling system flush

Posted by Owen_Dyneto On 2016/10/27 10:17:08

Here's one method: if you have antifreeze in the car, drain it and replace it with water and add the oxalic acid which you've premixed in some of the water, preferably warm. Go for a drive, perhaps 20 to 40 minutes. Allow the engine to cool down a bit and then drain the coolant and disconnect upper and lower radiator hoses. After the engine has cooled down completely you could use your flushing gun; I presume it's the kind with both water and compressed air feed. Do the radiator with reverse flow, then the block similarly and if you have a cylinder head thermostat, of course remove it. Assuming you'll be flushing with plenty of water it shouldn't be necessary to use a neutralizer (sodium bicarb or similar) to treat any residual oxalic acid though of course it wouldn't hurt to do so.