Daewoo Chevrolet Forums and Owners Club

Can anyone help with a foaming coolant issue.
My mothers Matiz (2000 0.8Litre) has suddenly decided to loose coolant from the radiator header bottle.
She took it to the local garage and they replaced the header bottle cap which appears to have reduced the loss of coolant.
However the return pipe into the bottle dicharges foam rather than liquid coolant.
The car has only covered 18K miles from new and has been regularly Daewoo serviced each year.

As a reasonably profficient diy mechanic I have checked out the following on the car.

Oil looks clean, no obvious water contamination.
Engine compression test 200 psi on each cylinder. Head gasket ok ?
Engine runs sweet as a nut with normal amount of power.
Temperature gauge normal. Radiator gets warm.
Coolant bypass valve functioning correctly. Fully open at 90 deg C
Coolant brown colour, possibly some evidence of some oil contamination.

The same local garage suggested the cylinder head gasket may have blown and recommended head removal etc.

Given that the car is probably worth about £900 in working order and the likely cost of this £400+ not sure how to progress.
Any suggestions where to find fault welcome.
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Change the thermostat FAST!, brown coolant-engine has boiled 100+.Also replace coolant with new one.
The gasket is easy to replace, just 6 screws and a new gasket, the price for that is enourmous.

Just try a coolant flush and if every thing is ok then dont go spending money for no reason on headgaskets etc,like you say the car wouldnt be worth it.
On the matiz m100 which yours is they fitted the wrong antifreeze at factory,this caused the heater matrix to corroide internally causing brown coolant,it even caused the matrix to block.I presume your heaters are blowing warm etc?. as yours is low milage its not affected it much.