[370_n55]

I've recently noticed after cold or/and wet nights(around or lower than 0 celsius) on cold start I hear short belt squeak which duration is around 10 seconds and then it gets quiet. I've ordered and changed belt, pulley and tensioner this summer. There's only 2 things that comes to my mind:
1. It's normal, condensation on belt makes it slip a bit
2. It's not normal at all and maybe I should check harmonic balancer(which I don't really feel like it)

However it's my first BMW and first petrol engine so maybe there's something I don't know. I would appreciate your input on this