My 99' Volvo V70XC AWD has white exhaust smoke coming from the tailpipe.

I had put some in about a month ago but the level if it has gone down then it hasn't by that much.. I never got any warning lights about coolant or anything other than what was detected earlier.. I see leaks in various spots under the engine right side, left front, middle left rear of engine.. I tighented two loose claps around hosing elements leading to the drivers's side, middle left, in the rear (closest to the steering wheel) but I'm wondering about seals and gaskets leaking.. Not sure where turbo return pipe is located nor the intake manifold gasket..?

The turbo return pipe is at the back of the engine, attached to the turbo and goes to the oil pan. Intake manifold gasket is between the intake manifold and the cylinder head.

Sorry.. no , the vehicle has never overheated...These are both common leaking problems w/this vehicle..could either or both be causing the smoke in my exhaust? I appreciate all of your knowledge