Many cars/trucks blow white until engine(actually exhaust system) warms up, depends on where you live.
When you combine gas("H"ydrocarbon) and air("O"xygen), and then burn it, one of the byproducts is H2O(water), so all gas engines make water and when there is enough in the exhaust system it drips out the tail pipe, lol.
This is why exhaust systems rust from the inside out.
Add humidity to the outside air, being sucked into the engine, and you get more water in the exhaust system.
Also outside air temp effects if you can see the white "smoke"
When you start up the engine and exhaust system cold, the left over water in the pipes, cat, muffler all starts to heat up, when it gets hot enough it turns to vapor, not "steam", when this water vapor hits the tail pipe and outside air it can condense, make bigger white "smoke" clouds.
On very cold days tail pipe has white "smoke" all the time.
Is your overflow tank full to the top?
Is the engine temp gauge going up then down then up higher?
Both of these will happen if head gasket is blown or if head is cracked.
No reason to fix it twice, but no reason to fix it if it ain't broken either