Ive got an 08 8010 and finally got started havesting mid last week. Noticed that it took a lot longer to get it up to operaing temp than our 07 did las year. A day or so later it wont hold any heat in the engine. It takes for ever to warm it up and never gets to where it should be during full load. Idle it back and you lose 30 degrees right away. Dealer was out and put in new thermostat, thought it worked in the yard but got to the field and same way. They are going to put another thermostat in and a new housing but they have never seen this before. Has anyone else seen or heard of this happening?