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I recently ordered mine from epay. Not a whole lot of options for that part. Good news is it’s probably the easiest repair you’ll ever do on your hmmwv 😀

Correct functionality should be thermostat opens first - then fan kicks on. If that’s not happening your thermostatic switch could be failing and/or your thermostat could be on the fritz. The tms have some good procedures to troubleshoot the fan system. Best Cap