I haven't driven a car in my life which doesn't slightly go to the right or left. So I don't think it is something to worry about if it is slightly going to either side. Mine goes to the left as we'll buy slightly; you can't drive without holding the steering.
Coolant issue is serious. It should not reduce but do mention how much coolant it's reducing.
Car should not be under powered on 2nd gear if rpm is at 3k but i can't comment on it as it depends on how we drive the car.
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