I've tried mine in the last hour and it does seem that if the AC is on then the active grille kicks in. I always have the hvac set to auto and therefore the AC is on. I'm glad I now know the reason so I will now only have it turned on when it's really necessary and avoid having cold air blowing...
So when I exit the car and before I lock it, there is a noise a bit like a fan and also the grille is visibly open at the front. Once locked it shuts and goes quiet.
I have noticed that after the vast majority of my drives in the MG4 Trophy no matter what distance, the active grille has activated. Even on cold days when I wouldn't expect it to do so it has come on. I generally drive it carefully so it's not due to thrashing it. Anyone else noticed it come on...
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