So my Cat 246 has miserably poor heat, and with snow season here I figured I would see if changing the mixing valve would help, while I was at it I would chance oil and all filters, also try to address a new problem, difficulty starting in the cold. And while I'm at it, replace the hand throttle cable that had just broken. This is a 650 hour machine that is primarily used for grading a road and snow removal.. nothing especially heavy. Soooooo. I find the side cover where the heat air intake is has cracked and needs replacing ( definitely a cause of no heat ) check the fuses for the glow plugs and they are fine.. however the top of the glow plugs are rusted and snap off in the head... fuuuuug. Figured I would replace both throttle cables while I'm in there and every floor bolt snaps when I try to remove it..I'm thoroughly sick of maintaining equipment, if it's not one thing it's another.. it's getting old.