Originally Posted by tabetha
If you are running with the cap off, then it is not pressurising the cooling system, which it needs to do to raise the boiling point of the coolant, some bubbling in the tank after running is normal, even when there are no problems, but the cap must be on at all times.
tabetha
Aren't you meant to run it up with no cap on to get rid of air locks and such though tabetha or have i got it wrong??
Id check the rad and heater matrix mate i dont think its anything serious or it would do it when running
