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My temp fluctuate between 78-85- sometimes 90 degrees, idk if that has anything to do with it

Hi , first of all, im not a car guy, but im interested to learn from you guys. I have an audi a3 8p the 170hp 2.0 tdi quattro verison, and i have a coolant loss, its not a leak cuz under the car its clean, when i first start the car in the morning, more smoke comes out then regular i would say, i get like some sparks feeling in the motor when its cold, like a shaking motor i would say. Maybe someone had the same problem? I dont really have a good service around me, i have to leave town to get it repaired, i just want an opinion if anyone had the same problem thanks