Does anyone know if the coolant cap is breathable?? The reason I ask is that although I changed the coolant, following my water pump change, I've noticed that small puddles of coolant have appeared on the floorboard. On further inspection, I discovered that coolant was hissing and frothing out of the cap! it had the image of a small foam party inside the coolant tank! I realised that the coolant dripping onto the floorboard has come from the cap!
I let the engine cool down and then ran the engine without the cap on. A bubble of air soon belched out of the coolant which suggests that was the reason the coolant was all frothy, and I put back the cap, and so far no froth...
Do you think that there
A. there is/was an air lock somewhere in the system
B. The cap is no longer "breathing" as i think it may have trapped air in the
system
C. The addition of "rad weld" was added to find the source of the "leak" caused the frothing and compounded the problem, and so i need to flush out the "rad weld"
Any thoughts??
Graham