I installed a new radiator and electric fans because my old one was causing overheating problems, now on the highway the temp wont go over 150-160* until i get back in town then it will heat up to 190 at idle, but as soon as i hit the highway back down it goes. I have a 180* thermostat is this too low should i go back to 190? Doesn't this keep me from going to open loop and cause the car to run pig rich?