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The truck came from Delaware so i "ASS-UMED" it was a cold climate truck and figured it had one. Now im getting quite sure i dont or if i do it has failed open. Only nhc 250 i have seen with a failed thermostat it failed closed and truck got hot fast quick and in a hurry before she shut herself...

Thats an excellent point you have brought up. I have all my coolant sitting waiting for me to have time and flush the truck. SCA's never even crossed my mind so now im curious as well. That said. No matter what i do i can NOT get my fan to come on or my truck to get over 170* on the gauge. So...