Please help bubbling noise

[VaporTrail]

Hey guys
My st makes a loud bubbling and gurgling noise from the overflow tank after a drive Would this be due to the pump still running after turning off the engine

Does this seem normal

My st is a late 2016 model so the header tank is upto date

Have opened the bleeder valve to see if any air is in the system but the oolant flows straight out and normally that means there isnt air in system

Any help would be great

this reflects Ford's secondary turbo cooling procedure: more common on smaller turbo engines like 1.0 ecoboost where the turbo runs hotter perhaps. Its usually normal. If you want to confirm that there is no head gasket failure issue, check UTube for the "how to test for head gasket failure for 50 pence"