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I left 4 hours later and 4 miles later the engine overheated in traffic due to a motorway being shut.
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I quickly turned on the heater to full blast which lowered the temperature gauge.
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I then checked the reservoir which had all my coolant inside! I took the rad cap off, yes stupid thing to do, but there was no coolant to blast into my face.
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I added 3/4 litre of water and then some unmixed coolant into the rad cap neck pipe.
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I then covered 210 miles while tentatively driving no more than 60, which took bloody ages!
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Nothing has happened since.
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This is the first long haul drive I have covered since this engine was put in.
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I have covered 10k since the engine install.
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I am hoping it was an air lock but am I clutching at straws?