What is the proper coolant temp while running?
My wife's Altima has sub-par heat. She took it in, got reading of 123 at idle and 150 at 2500 rpm. Seing that this car has 2 thermostats, 1 at 180 and 1 at 203, I would expect the coolant temp to be in 190-200 range. Which thermostat is the culprit or should I change both?