engine coolant flushing

[dalgrae]

Advice please I have just removed the front grille/radiator to install the new timing chain but came accross the the same problem for the 3rd time, when I opened the radiator drain tap the coolant was a dark brown colour , yet I have twice flushed the engine and back flushed it with a hose until it ran clear, I have done the same with the radiator but I keep getting this dark rusty coloured water I use an antifreeze that says it has rust inhibitors in it .What else can I do, I have thought of using some cheap Cola in the radiator leaving it for a couple of days and the flushing with water as I have used this method before on certain items .When the head was off some time ago I made sure all the waterways were clear ,I flushed the block through the water passsages until it ran clear.

Any advice would be most welcome

[bmcecosse]

First advice - never use the drain tap - it may break off! This is general advice for others - your's seems to work ok, at the moment. Just flush with hose - by all means try the cola - but unless you have an overheating problem, don't worry too much about the water colour!

[dalgrae]

Thanks for the advice I am happy about using the drain taps as I have had them completly apart and lubricated them , I intend to try and find some Bluecol antifreeze unless something else is better that you know of

[bmcecosse]

I just put in some cheap stuff about 3 years ago... For many years I just had water in there - but it was cold enough then to add a pint of a/freeze.... The secret is to leave the same fluid in if possible - all the dissolved oxygen gets pushed out and the fluid left is nice and neutral..

[dalgrae]

Thanks for the advice which I will take up

[M25VAN]

and don't buy the readymixed, buy concentrate. You will be paying for them to dilute it for you....

[dalgrae]

Thanks for all the advice I now know what to do

[David53]

Running a hose through doesn't always clear all the crud, even if the water runs clear after a while. Run the engine up to temp for twenty minutes or so with a coolant flushing agent in the system, then drain and run the hose through and if necessary use a flushing agent again. I did this on one of my cars recently and it took two run throughs before it was thoroughly cleaned. Now stays nice and green

[bmcecosse]

Don't put ReadyMix in - that will never work! http://www.readymix2go.co.uk/cemex/?gcl ... tAodESoAZw

[dalgrae]

Thanks Roy for the info I had already decided to use Carlite Bonding and not Readymix

[bmcecosse]