Fresh 4.0 build. Will run all day in stop and go traffic or idling up some knarly trail in 110 degree weather and never go over 195. Pull a hill on the highway or travel down the highway at 3000 rpm and it will over heat in about 5 minutes. Temp comes down if I slow down.
What I have done: new flow cooler water pump, high flow 194 thermostat, new double row aluminum radiator, new CPS, flushed the holy hell out of the system with Red Devil Flush (3 times), added wetting agent, running 60/40 water to coolant ratio.
Engine sounds great. Pulls like a beast. No stutters, backfires or misses. However, it idles past 12 degrees advanced, more like 20 degrees.
What I have done: new flow cooler water pump, high flow 194 thermostat, new double row aluminum radiator, new CPS, flushed the holy hell out of the system with Red Devil Flush (3 times), added wetting agent, running 60/40 water to coolant ratio.
Engine sounds great. Pulls like a beast. No stutters, backfires or misses. However, it idles past 12 degrees advanced, more like 20 degrees.