What is turret's heat cooling relied on?

[FishBone.EarthKhan]

I noticed that recently a turret heat feature has been added to the game.
Sometimes it cools down normally, I can shoot the main turret for 3 times before overheating.
But sometimes, especially during battle, the turret cools down pretty slow. In the situation I talked about above, the turret cools down to about 40% when recharged again. But in latter situation, the main turret only cools down to about 55% when recharged, and next shot makes it overheated, instead of about 80% in former situation.
It was said that low coolant helps the turret cool. But in last battle, even low coolant didn't make much difference.
I have checked the manual but nothing mentioned about the turret heat.

[EngBot]

Heat cooling seems to be affected by Percentage of power to weapon, Coolant state, Barrage, the W.D. Cruiser, BKP-WPN-Power, if the weapon is fully charged and ready to shoot, and if the turret is a main turret or not

So I think your heat problem is from power, coolant, and possibly just no letting the gun rest for a few moments