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Merry Christmas to the members of the Vauxhall Owners Club Enjoy the festive break and see you back here in 2025

Hi AndyR Just had the same issue if no noise coming from water pump it sounds good check your thermostat just changed mine and it gets up to temp a lot quicker and sits nicely between 88⁰-92⁰ hope this helps all the best.

Hi Andy It is possible that the waterpump impellor isn't working as well as it was when it was new and in the case of some old BMWs the impellor used to come off the shaft and sit idle and blocking the waterways. Remarkably, the engine gave no symptoms of any issues except for when sitting in traffic (thermosyphon system working as it should do) Worth replacing if in doubt but also don't forget the coolant expansion cap on the reservoir as if this is faulty then it can cause the same symptoms