How hot is too hot
Greetings guys and gals. I am in need of some advice about the cooling system on my 87 YJ, 4.2, BBD, Man-trans, A/C. I overhauled the cooling system over the past two weekends and replaced the leaking radiator, thermostat, all the hoses, waterpump, fan clutch, and even the failing heater core. The system was flushed with the usual prestone goodies, refilled and burped. Prior to the overhaul the temp gauge never hit 180 around town and never dropped below 210 on the highway (65-70mph). Since the overhaul, the temp begins a slow climb to 210 and stays there +/- 10. I always read things that say the cooler the better, but as near as I can figure this nice steady temp is a healthy sign. The factory recommended a 195 thermostat so that is what I installed to make sure things were getting warm enough for the computer to go closed loop. Does this sound like an OK situation or should I pursue another method of lowering nominal operating temperature? BTW the rig is run at 5280ft altitude, 8 deg BTDC @ 1600rpm.