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HG failure? symptoms inside


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this is a bit of a strange one but i really feel my Headgasket is now fooked...

Symptoms are as follows

Very small amount of Mayo on underside of oil cap

Water in expansion tank frothy and bubbling when revved

Water in expansion tank pressurised, goes to blow every time you take the cap off

Now the reason why its strange is because of 2 things

Firstly i have a minor oil leak, possibly from the sump, had to drive through deep water with the cornwall floods the other day to get to work, have only noticed the mayo since then, could water have forced itself into the sump?

Secondly a fair while ago i blew a coolant hose, we simply chucked it back on and re filled with coolant, could this have caused air in the system causing it to presuurise?

Any help would be much appreciated, i plan on having a compression test to try and be sure, its just worrying the hell out of me tbh as the car needs to be ready and spot on for Ultimate Dubs early next year :( and i've only just convinced myself i really wanna keep it

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