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[zippo]

Anybody know what would cause the in coolant in the header tank to
boil and change colour from the red as it should be, to a dirty brown
tia
Daz

[Lazydocker]

Oh dear... I may be completely wrong but it sounds like a rare head gasket failure due to something else packing up (water pump/thermostat)   :-/ :-/

I hope I'm wrong!

[zippo]

that wouldnt be good

[FRE07962128]

Anybody know what would cause the in coolant in the header tank to
boil and change colour from the red as it should be, to a dirty brown
tia
Daz

Sounds like direct contact of the water with the combustion process i.e. water entering the cylinders.....sorry but it does not look good.  A head gasket failure!

[albitz]

thermostat stuck closed ? :-/ hope it isnt too serious mate.

[SP_3.2]

Sounds as if it could be oil cooler  failure is there any mayo on oil filler cap or dip stick

[zippo]

thermostat stuck closed ? :-/ hope it isnt too serious mate.

the heater blows hot ,theres no oil/water contamination ( just checked)

[albitz]

whats the temp gauge doing ?

[zippo]

whats the temp gauge doing ?

a steady 85

[Kevin Wood]

It's normal for an engine to boil over with the cap off the expansion tank.

Is the engine overheating? Is the expansion tank cap venting?

How does the engine run?

Kevin

[zippo]

It's normal for an engine to boil over with the cap off the expansion tank.

Is the engine overheating? Is the expansion tank cap venting?

How does the engine run?

Kevin

allright Kevin how you doing
      As far as i know the engine is fine, iam not sure what you mean by venting

[hotel21]

http://www.omegaowners.com/forum/YaBB.pl?num=1209123016


as a very rough guide......

[zippo]

Thanks Bruce ,before i get upset with it ill try the flush if that doesn't work ill have to take it in. its not lost water, just changed colour

[FRE07962128]

whats the temp gauge doing ?

a steady 85

If the temp is a steady 85 it is at normal operating temperature and is not being affected by any contact with combustion as I stated earlier due to your misleading description of "boiling".

[Marks DTM Calib]

Right

A few hints here.

Water boils at 100degC unless its under pressure as in a well maintained engine cooling system.

So, release the coolant cap on a hot engine and the water will boil!

What you can also get is any sediment in the system may be disturbed in the process causing gunk to be thrown out at the same time.

Also be aware that the 4 pots do not have the same sort of oil cooler setup as the V6, only the 2.2 has a small oil cooler which is sandwiched between the oil filter and oil pump and is not known as a failure item.

If the head gasket was gone, I would expect rough running, particularly when the engine was first started as its likely that one of the bores would be full of water!