bad coolant

[kawo]

I found my coolant is contaminated. Is it very bad for this condition?

The contaminant in the reservoir is difficult to clean off, I can't imagine how could I clean it off the whole radiator and engine...

Is this problem common in 4AG?

I am planning to flush the coolant system for a few times to see if the problem could be reliefed. Any suggestion?

[totta Crolla]

Looks fairly normal for a old engine and cooling system.
To thoroughly Flush the system through you can take out the radiator and flush it separately.
Personally I would fill the system with water and run it like that for a few days and flush it all again, finally filling with the right grade of coolant.
Don't forget to open the heater valve to 'hot' before flushing and refilling.

[fax0815]

Had that before, there seems to be a problem with 4AGE´s und blue coolant.

Make sure you buy the right pink coolant!

[d3nso]

Use pink or green collant in an 4AGE not the blue, as said above before.

[fax0815]

d3nso Wrote:Use pink or green collant in an 4AGE not the blue, as said above before.

Used green after blue, that fucked everyting up, my rebuild engine looked like a 200000miles no service engine with loads off clear gunk, went pink and never had any problems again.

[kawo]

I flushed the cooling system last night:

1. drain old rusty coolant
2. put tap water + radiator flush cleaner, run about 10mins until engine warm
3. drain and flush with tap water continuously for 30mins
4. repeat 2 and 3
5. put tap water, run until the engine is warm, let it sit for 2 hours
6. drain, there is still a little bit rust color but it is way better than the first drain, 10 times better

I now put distilled water with Redline Water Wetter to the radiator. I did not put anitfreeze as weather here will not be freezing.

I know the water inside the engine that blocked by thermostat is still tap water, I will try to drain the whole system next week and fill with distilled water to better dilute the tap water that I scared it would cause problem.

[allencr]

kawo Wrote:1. drain old rusty coolant

IT Needs a rust inhibitor!!!!!!
It may need cleaning/flushing with chemical - TSP or drain cleaner.
It does not need distilled water.
It does not need 'water wetter'!

[kawo]

Oh, I thought the Redline Water Wetter is some kind of rust inhibitor.

allencr Wrote:

kawo Wrote:1. drain old rusty coolant

IT Needs a rust inhibitor!!!!!!
It may need cleaning/flushing with chemical - TSP or drain cleaner.
It does not need distilled water.
It does not need 'water wetter'!

[Apsogos]

a good coolant is the Eneos and it has red color...