I wanted to flush my trucks coolant and I was wondering if i had the prosses down right. 1. Drain rad via drain plug under it. 2. Drain motor via lower rad hose . 3. Reatach hose fill rad with distiled water and run truck keep adding distiled water till rad full, and run truck for 2mins the repeat step 1 & 2. Then reatach all hoses and fill with 50/50 coolant. done. Is that the right prosses?