Coolant bubbling up on opening

[Yatz]

As I was due to take my Chimaera for a run I decided to check its coolant levels. The car had not been driven for about five days. On opening the coolant cap, a certain amount (not much) of liquid came bubbling out. Is this normal or is this a cause for concern?

[HiAsAKite]

Cause for concern. I had this.


Was a result of a very slight crack in the lining which resulted in the cooling system slowly pressurising (from the cylinders)when driving.. to the point that after 150-200 miles driving it would vent coolant when hot, and remain pressurised after driving even days later- such that if I opened the resevoir- it would bubble out

Was all sorted with an engine rebuild from Dom and his team.

You might be luckier than me.. eg a gasket etc

Edited by HiAsAKite on Sunday 3rd September 13:57

[keynsham]

I had the same on my 350i. It was the head gasket leaking between the bore and water jacket giving the same result. This is a common issue on loads of cars and is just an age and mileage issue. I don't know if Chimaera's suffer particularly from cracked liners? but I have had a lot of V8 Rover engines over the years in old Rovers, Land Rovers, etc and I haven't come across it before. I hope it is just a head gasket!!

I bought a kit from Amazon which you can use to detect exhaust gas bubbling in the coolant. It starts with blue liquid and if exhaust gas is detected then it goes yellow......