I just finished installing my engine preheater and cab heater for winter in my 660. I jacked up the front of rhino, took off wheels for access clamped off the passenger side hose down a few inches from passenger side bottom below steering. Clamped off rad side of hose cut hose and inserted preheater. I then cut in my cab heater in/out lines after my inline temp sensor and before the rad. I am getting ready to refil the rad. I have a fill valve up top by my heater at the highest point. I was considering just filling up to top then starting rhino to bleed off any air.. is that a good way to go? letting gravity take its course... I dont think i will have any air in the block as I did not drain it out. Do you guys have any tips? Will it get airlocked or over heat while starting it as I bleed it out?