about car

it was so lovely day.firstly, he unlock to car, he got in car, started the car, turned on the radio and turned down to aricondation .

I don't know if you are talking about yourself if you are then the correct way of speaking about yourself would be by using "I"
you say : it was such a lovely day.first, I unlocked the car, I got in car, started the car, turned on the radio and turned down the aricondation .

if you are talking about another male you can say "he" and replace "I"  

About the Car

It was such a lovely day! First he unlocked the car and got in the driver's seat. Then he turned on the radio and turned down the air conditioning.