Rite, the problem i have isnt on my pulsar for a change lol just thort i wud pop a question about my girlfriends pug 106 diesel, an engine is an engine so just seeing if some1 will agree with what im thinking, we bought the car yesterday with a coolant leak from the radiator, i have replaced the radiator today but wen toppin up the coolant and bled it off, i put the cap on the expansion tank and started engine, immediatly the coolant pipes wer very pressurised, removed the cap and the pressure that came out was out of tge ordinary, am i right in thinking that this problem can only be the head gasket?????