Need some clarification on the sight glass. Mine show bubbles but will run to low 50's on hot (90) and humid (always) days. I dumped in some red dye leak indicator after bleeding the low side to nearly zero pressure and bumped up the pressure to about 40. No leaks and no change in temps, recirculated. Took it for a drive to let the radiator do its job and got to low 50's. Everything seems to cycle correctly, gets colder upon driving for a few minutes, radiator is clean, bubbles show, pressure at about 40. Any suggestions? Is this all I can expect? Dark blue truck adds to heat absorption.....