I have an '04 D2 with original 4.6. I replaced the head gaskets last fall and I want to make sure I'm keep this thing running at the right temp. What's the ideal temp range? When driving on the highway, mine will usually stay between 188 - 195F. The other day in heavy traffic, hot & humid day (90F), waiting at stop lights, it hit 210. For context, I replaced all coolant system hoses, water pump (OEM style), and thermostat last year. Thanks.