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Jackaroo gasket

I have a 1999 Holden Jackaroo diesel that has just recently been back to the dealer to have the clutch and flywheel replaced. After getting it back the car has been blowing lots of white smoke and has been boiling. I took it to my local mechanic who did a pressure test on the cooling system and reported that it was all normal and he said it could be a blown head gasket. What do you think the problem could be?

It could be a blown head gasket as your mechanic suggests, but he should be able to test it to determine if it is blown or not. You should also be able to see evidence in the form of a milky substance in the coolant if it is a blown head gasket.

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