Quote:
Originally Posted by PosiSaxo
done mine on about 17 quid, just a gasket.. no skimming no new seals or bolts!
Pikey 4 Lyf 
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I have re-used head gaskets before. beat that. cost = nil. (also lasted 36,000 miles and just starting to weep oil from the corner)
Quote:
Originally Posted by AirVTS
As a complete novice with cars I have to take what the garage tells me.
Should he be able to tell if its gone already then?? The coolant cap used to hiss on its own after the car had been running for a while but I think this was just a dodgy cap?
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from stone cold, he means start it and run for 20-30 seconds and see if it hisses. Cooling systems are designed to pressurise to around 10-15psi because it helps stop boiling of the water slightly.
If you can't see water in the oil, or oil in your coolant, get a compression test done.
If all of the above is ok, and so is the compression test then it's not the head gasket.
Sounds like your trusted mechanic is just being a bit lazy