On most vehicles these days, thermostats don't begin to open until around 85'C, and fans cut in around 100-105'C. This is why systems are pressurised to prevent the coolant from boiling at normal 100'C. 120'C is about maximum temp.
ACMS Mercedes Ltd is an independent Mercedes-Benz service specialist based in Walsall. The company provides high levels of customer service and quality workmanship, at competitive prices. Call Mark on 01922 634666 or 07530 456000
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