Hi, Im getting really high pressure on my top radiator pipes, and after about 20min of motorway driving the temp goes mantal, So I thought it could be the water pump or thermostat, so I got them changed but still the same thing, when I have the lid off there is a small amount of smoke coming out of the rad, and the top pipe gets hot not the bottom, and when I shut the rad the pressure builds and no water cant get round as the bottom pipe is still cold. my mechanic said it sounds like its the head gasket, now I have 122700 on my clock, but I see that this a common fault and people have been having the dealers do it for free, its been looked after by lexus all its life in Lexus in Bury, so does anyone think I have a chance of them sorting it out, since they have been dealing with it all the time, they would have seen something like this happening, What do I say when I go in, as im rubbish at this type of stuff,
Also I have rust forming under the aint of my bonnet, and If im not mistaken that's covered by the 12 yr warrenty?
Thanks
Luke