Chocolate brown

[Radmobile]

Chocolat brown coolant.

So I'm sure I have a head gasket or cracked head but can anyone tell me why the coolant goes poo brown? Is the combustion gas going into the radiator?

Because the water was chocolate for a long Time but the bubbles only came up after a big drive last week. Just trying to suss if there was a previous problem that caused the brown that in turn caused the crack.

No mud play for me!

[growler2058]

Exhaust contamination sounds like a good theory mate. Have ya always run coolant could it be rust from block water ways???

[Radmobile]

Was replacement engine so not so sure on that one, but yea it's almost red.... Anyhow new head and gasket when I get a free weekend. Hopefully get it all back in check. Was running great n great power for a rd28 don't know what he did to it.(the last owner)

[Wine_maker]

Mine coolant also was a color of coca-cola and foaming like it when I bought my shorty.
Then I drain it and fill new and no color changing more than 9 month.

[nissannewby]

Is there any change in your engine oil colour and level? And does your coolant level vary? The radiator could just need a good flush as well as the block if these stay dirty when performing a coolant change it will dirty up in no time. When you pull the head off check if there is any fluid in the pots

[billyj]

just get a mech to do a gas test on the cooling system takes about all of 15 mins and will tell you one way or another

[Radmobile]

cheers guys, ill start small n i guess finish up with the major work, pitty shes runnin pretty well

[Radmobile]

Gas test Thursday and pull down weekend! Let y'all know how it goes. Cheers for the comments !

[Radmobile]

Supprisingly no gas in radiator :/

[LittleJohn]

Gas test is for leaks in the system , not actual gas i thought ! LOL's

[nissannewby]

Yeah the gas test usually makes a liquid or something change colour with the carbon monoxide (from a petrol) and with diesel there would be a substance that reacts with the combustion gases if there is any in the rad system (could stand to be corrected here)