The engines been making a whistling type noise for the past week or so (read 3 weeks).
Today whilst sitting in traffic I looked down at the temp gauge and it was going beserk, i.e. it was well past the maximum temp mark, it was then very irratic just moving up and down.
I pulled over popped the bonnet to check the radiator and unscrewed the water cap just enough to let the steam out, the water didn't instantly evaporate so I figure the temp gauge is a filthy liar.
Is it the head gasket?