Disappearing Coolant

[DrivingZiggy]

I haven't kept strict track of how much I'm losing. Probably about a gallon a month, but I also probably do many fewer miles than most here. I will be checking the bunk heater first, then tightening the hoses second. I think it could be the bunk heater though, because I remember that I smelled the coolant when I used it this winter.

Besides that, I'm guessing it's time to do the tune up?

I'm also due for doing all the boxes. I was thinking 350K, but I've been noticing that the shifting doesn't go as smoothly as it used to.