Should the coolant tank cap be completely air tight?

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Originally Posted by Young Angus

Well it's certainly nothing along the lines of a blown head gasket...and just to clarify I am talking about the plastic coolant reservoir cap...not a "radiator" cap. From what I'm reading though it's nothing too far out of the ordinary anyway so I'll rest easy about this one until someone tells me otherwise :D

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I was replying to Phat-Customs about his Radiator cap which works exactly the same as your screw-on header tank cap, so if you don't have the symptons of a blown head gasket, you can rest easy, Regards Frank.

Ahh wonderful...I figured as much. Thanks for that Frank :)

My only added advise would be to check the water level inside of the tank once a week, Saturday mornings is when I give my old girl a going over, oil, water and general check to see if there is anything glaringly not right.

I haven't really had to add any water but it's a very cheap insurance as boiling an aluminium engine can cost big$$$