diesel_lv
Well-Known Member
I've never put a thermostat in hot water to check one before, never needed to. So yesterday I found about 3 laying around my garage and decided to check them. One 160° Stant, one 180° Stant and one 195° Robert Shaw. Every article I've ever read on cooling says the rated temp is the start opening temp and fully open 15° later. Every one of them started opening 15° cooler and fully open at rated. I kept wondering why my car would never get over 148° in the winter and 157° in summer on the interstate. I had a 160° Robert Shaw high flow. It starts opening at 145°. Changed it to a 195° Robert Shaw for the coming cooler months and will see if I can finally get my car to run at 180-185ish.