Leaderboard

Thanks for your input Magnet. Yes I have had similar thoughts as yourself in regards to it possibly being a faulty new thermostat, but hoping it isn't as that is an expensive fix 😞 I have received the temp sensor today and will go ahead and change it tomorrow as long as the weather is okay. Will see if that fixes the issue. Before the thermostat was changed, I never had a gauge reader for the temp as the S3 only shows oil temp and not coolant. I bought an aftermarket gauge reader which connects to the obd and shows the readings of many things including the coolant temp, which is what I've monitored after the thermostat change and it's been erratic. Only thing stopping me thinking it's the thermostat is, yes because it's new and also the fact that if it was the thermostat I believe it would have erratic readings but not that dramatic as I'm getting and also the heaters would fluctuate in terms of the amount of heat they give but the heaters are always hot but only get cold when the temp goes below 30°c Again that's just me wishing for the best and it not being the thermostat and hoping for a much cheaper fix I guess I won't know for sure until I've got this temp sensor changed and see how she runs after that. I will keep this post updated once I've done that Kind Regards Raffy

Elimination of the vibration and high temperature at that disc is good enough justification for changing it, though I am curious to discover if the black mark really is a crack. Could you drag a hard steel tool like a chisel or scriber across the line to feel if it catches?