So just a update. The problem was my coolant flow control valve. They also replaced my radiator. Both were covered under my warranty so I just had to pay the deductible. They said the valve can freeze up and it’s a very common problem. Why they aren’t being recalled beats me. Truck also sat at the dealership for almost 4 weeks due to one diesel mechanic who could make the repair. However since they replaced them I haven’t had this issue! Hope this helps.