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Coolant leak after service/MOT
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First thing is to find out if you have a leak. Brim the system and with the pressure cap off, start the car and idle it, let it burp out any air leaks and keep on topping it up. If there is an obvious leak from a hose, pipe, radiator or any other part of the system, turn it off and have it checked over.
Incidentally, there is no way your car would have run 70 miles with a leak and/or the pressure cap off or very loose. It would have overheated and shot out the systems coolant well before that.0
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