It's a 1990 Mercury Grand Marquis 5.0 EFI.
Changed the radiator, thermostat, water pump, fan clutch and all hoses.
Normal highway driving the car runs cool but as soon as the traffic becomes bumper to bumper and/or stop and go, the temp shoots right up. Not overheating but the needle shoots to just below the line before the "H" and if I don't get back to a long run drive on the highway the needle stays up there.
Also, it does not lose one drop of coolant no matter how hot the car gets. Is there something else that I missed changing? The all around running of the car is very good except for this.