Hi Simon,
I personally have never used hard water I always put premixed oat coolant in the car I dont know what the garage has done though but the cooling system has been flushed many times for various reasons and it's all new a few months before I bought it it had the heater matrix replaced so I thought that that perhaps now the running cooler caused it I could claim to DMGRS that the thermostat is faulty I guess but at the same time I don't feel like replacing the thermostat again
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