I have a 2016, 850 Max XT and if I leave it idling, as soon as the fan starts I can see bubbles coming from the overflow tube attached right under the coolant tank cap.

What could be causing this. A bad coolant tank cap (i.e. it’s too weak to keep the pressure)?

Thank you for any responses!

p.s. Never overheated, no limp mode ever.

I have a 2016, 850 Max XT and if I leave it idling, as soon as the fan starts I can see bubbles coming from the overflow tube attached right under the coolant tank cap.

What could be causing this. A bad coolant tank cap (i.e. it’s too weak to keep the pressure)?

Thank you for any responses!

p.s. Never overheated, no limp mode ever.