Good morning All.
Pls kindly help identify the attached image. My car Volvo s80 radiator water is leaking. After working on one leakage, another one will surface. I was told by m Mech to replace the plastic on both sides of the radiator since its a double cell which I did but the radiator was still leaving coolant. I was later advice to change the radiator which I did but the funniest thing is that it's still leaking from where it was before I change the radiator and this made me believe the leaking coolant is not from the radiator. But again my mechanic showed me this that the leakage is caused by the attached image. But please what I'd the function of the attached image.
Note: The leakage will not occur hen the water is cold or at normal temperature but when I have driven the car and the coolant becomes hot.