So my truck back in February when I got gauges I realized my Ect was only around 150-170 tops so I got a mishimoto 200 hi temp Tstat Bc it was in the 30's at the time and I read and heard it help warm up and running. At the end of March I got my truck bullet proofed and while driving it after my ect temps start running from 200-218 with no load or hard driving. I didn't like the looks of that so I went and got a 190 motorcraft Tstat and housing and my temps are still rising up to 208 or so with same driving habits. I did notice though if I turn my heat/defrost on that my truck will run anywhere from 188-196. If I turn heat/defrost off the temps will rise again. What could cause this, Tstat or something else?
Thanks in advance for the help.
Thanks in advance for the help.