Agreed on the pump up. Easy way is to drill/tap the stat housing to 1/8 NPT for a "tank bleeder valve" several dollars at Oreillys. its a brass Schrader valve to let you use an air chuck to pressurize it. Good idea while you are in there to add a 1/32 or so hole in the stat flat metal for easy/faster fillup (lets the air come up/out during the initial coolant fill) and I like to have the psi going both ways which it will anyhow but its my OCD!. Holler what it ends up being. PS go easy/monitor your time as it gets to 15 fast & if your bypass hose starts to swell to near bursting you are definitely way past 15, DAMHIK. You ain't airing up a truck tire!
