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Hi, after driving for about 40 miles, my car is losing sufficient coolant to empty the expansion tank. I’ve had the car pressure tested and the general system checked. All sensors are working as they should and no leaks could be found. An air lock was suspected so the system was drained and bled. The heater works fine. After this work, the same thing happened after about 40 miles (low coolant light comes on). I’ve checked the car myself when it’s fully warmed up and I can’t see any leaks. There is no white “mayonnaise” in the oil filler area so it’s not head gasket related. Any ideas as this one seems to be a real mystery.
Thanks, Ian
 
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