Engine Cooling problem
2001 Citroen C5 4 cyl Front Wheel Drive Manual 100000 miles
I have a problem on my C5 with engine cooling system. During the engine operation I get a caution message Top up engine coolant level. I usually stop the car and check the level in tank and it is actually almost empty. But if I wait for about 15min and then open the tank cap, it reliefs the pressure and the coolant liquid fills up the tank again. Sometimes it also gets filled up during the engine operation and caution message goes out. Engine does not get overheated.
I had suspected that the problem was in cap relief valve but I have tested it and it appears to be serviceable.
I would appreciate if someone could help me find a reason for that problem.