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Opinions? 6.0 running hot!!
2005 f250 6.0
Replaced the ficm last week and truck seems to running outstanding! Dumped overflow resivior while doing this and then just topped with water.
Made a road trip yesterday about 400 miles round trip. Outside temperature reached 110*
Truck started running about 3/4 of the temperature gauge and could hear the truck whining a little. Slowed down to pay toll temperature went back down to the middle of the gauge. Took off (up hill) temperature began to climb again. It gets right before the "H", slowed down and it would fall to about 3/4 mark again. Occasionally climbing hills would warn me "check engine temp" I would slow down and it would cool a little.
Any idea of whY boils be going on? Could it be that I have too much water in the system and not enough coolant? Could my thermostat be sticking?