So... the car is a '53 Corsa 1.0L 12v, 64k on the clock. Missus broke down on the M4 on the way to work today. Apparently the coolant temp suddenly went up to max, engine started making nasty noises, forcing her to pull over on the hard shoulder. Car didn't stall. AA man who towed her home said head gasket. Apparently he did a "test" and found "combustion" in the expansion tank. So I get home from work and do the diagnostics. Expansion tank was empty so I filled it up with the right stuff. Car turned over with a bit of persuasion with the gas pedal. Aside from the obvious here are my diagnostics results: - Inside of filler cap is normal - Oil level well above min - Exhaust blowing very pale black smoke when revving, not when idle (could be normal?) - Rough idle (could be normal/paranoia?) - Water pump was toasty after engine running for 5 mins (if that is indeed the water pump I labelled) So wtf is that pipe then? Missus said that the AA man examined that pipe and did not mention to her that it was not actually attached... Maybe he snapped it off, the miserable cnut? Attention was drawn to it because there was water bubbling around it. No coolant came out it must be an outlet. Looks to me like the plastic bit which has snapped (with half of it still in the pump) is threaded as there is a plastic hex bit on the end of the pipe. Any ideas?