Hi i have a bmw 316 compact 1.9 1999 and recently it has developed 2 problems at the same time. The first is that it doesnt reach operating temperature anymore always runs cooler than normal but the temperature wanders depending on speed. At 70mph it is cooler. It has also started to use a lot more petrol. The two problems are councident with the cooling system running out of water due to a hose problem. any suggestions? I suspect the thermostat failing open but can this cause a very noticeable increase in fuel consumption? thanks very much
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