Hi guys, i have a 1990 fiesta rs turbo, when the engine is at normal running temp and is switched off there is a bubbling noise coming from the top hose and you can feel the coolant passing through it. I've carried out a headgasket check and it came back as all o.k, i have also pressure tested the cooling sytem and found no leaks.
Any ideas or suggestions would be much appreciated
Many thanks Tom