Remi Bugnon

You where right, I just changed the head gaskets (again...) and it works fine. Was really stupid but I've learn something. Thank you

Just realize it regarding the picture, don't how I've done a so stupid thing.. I'll change them and let you know. Thank you

It seems good like that, have done head gasket many time but not on those trucks

It's possible I've done that but not sure to have seen any side on the gaskets. Can you tel me if it seem right? I have a pic

Thanks for answering, it seems weird to me but I just try to make it hot with the cap a bit open and it not seems to do that. I will order a new and let you know if it solve the issue. Thank you

Hey all, I have a 2014 Sierra Denali 6.2. I have a cooling fluid problem and I can't seem to find a solution. When the engine heats up, it makes noise in the cooling circuit, like bubbles and you can feel it in the pipes. Only when the engine is warm. The cylinder heads were dismantled to change the tappets which made noise. I've done 3000 miles since and never needed to add coolant. It's like it's badly purged or too hot but it's only at 200. It continues to do so for a few seconds when I turn off the engine. I changed the water pump and the thermostat but no changes. I can't find a solution. I can post a video Thanks