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What is the best way to check a head gasket?

I had the head gasket checked,they used a tube with blue liquid in it "sry dont know the name of it"
but I was also told there is a pressure is it worth it for me to pay another 150 to get it done?
Trev, May 2005
The test the garage did was testing for fumes in the water system, I have found this very unrealiabe in the past, I was told that there was no problem when in fact the head gasket had a leak and cost me a new head (very expensive).
2 Things to look for:
1. Oil in the water, this will make the water in the cooling system change colour, it will go a brown sludge colour.
2. Water in the oil, if you take the oil filler cap off then there will be a light brown sludge in the top of the cap.

Also if the water in the cooling system is being forced out of the pressure cap this is also a sign of a blown head gasket as the pressuer inside the engine increases.

Andy., May 2005