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You would appear to have a large leak if you have so much pressure in the system and no amount of K seal or anything else will make any difference at all. Seems you're right, 1 x bottle used today with no effect :( The cheapest way out would be to fit a secondhand head, there must be lots of them a...

Hi Peter, thanks. I'm pretty concluded that it is a head leak causing the pressure. I'm going to try my luck with K Seal tomorrow, there's enough good reports of it out there that it's worth the £10 for a try. The question failing that will be whether the head is likely cracked, cos it's curtains fo...

Hey, thanks for replying. I fear you are right sadly. I'm looking for a way to check without starting proper work on it if possible, like pressure testing the water system - but it sounds to me like it'll find another leak before the one in the head if I try that. I'm also wondering if K Seal really...

Hi, new to posting on the forum but I have been here for help many times before, great site, thanks! I am now stuck with filling the coolant system since overheating last week, I fear I may have damaged the head or gasket. The engine runs & seems fine but coolant pressure blows the rad pipes off bef...