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Discussion Starter · #1 ·
For a while i have been losing coolant on motorway drives, i drive around 100-150 miles and then the coolant light comes on and i have lost from max line to below the min line.

I have recently had the water pump changed, replaced thermostat and thermostat housing, and radiator fan switch. The radiator is only a year old. I have had it pressure tested and they cant find a thing. The Head gasket hasnt gone nor is there coolant in the oil or oil in the coolant. I am at a complete loss now, around town it wont lose any coolant , it only loses coolant on motorway drive. I have driven on motorway with heater off and i still lost coolant so i rules out the heater matrix, ANY ADVICE OR HELP WILL BE GREATFUL.

Thanks.
 
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