77
« on: 16 December 2009, 14:59:54 »
It's probably not the head gasket but the HBV, it could be something even as simple as it was on mine that the two bolts that locate water pipe to the back of the block weren't tight. HBV is a common issue, fiddly to do but not expensive. Lots of posts on here about how to do it and test it too. If you suspect a headgasket you can do a chemical sniffer test on it (available from motor factors) that will definitely give you an answer. You can also ask a garage to do a pressure test. This is done very simply, they attach a pump to the expansion tank and presurise the system, they leave it pressurised and watch for drops, that will tell you if there's a leak. I found that mine was using a bit of coolant but the problemturned out to be that I hadn't bled the system properly and that caused airlocks. Hope this helps.