I recently noticed that my fan began cycling on and off very quickly even when the truck hadn't even warmed up properly. Today, I installed an OEM thermostatic switch and noticed that the original which came with the truck looks quite different. Wondering if the USMC accidently received a batch of aftermarket parts.
Will test run tomorrow to confirm proper function.
Original on left, OEM replacement on right.
Post Test Drive Update: Fan operates normally and closer to advertised temps. Cycles on at approx 220 and back off when approx 200-210. The original thermostatic switch ran the truck cooler when it was operating (cycled on at approx 200 and off after cooling down several degrees). I suspect it was an aftermarket replacement even though it was installed original to the truck.
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