The one in my '08 is fine, but that's a different engine.
My guess is media misrepresentation. Maybe FCA dealer did say "$5,540 to repair" after a thermostat failure. But just what was the failure, and what else did it cause to fail? Did it cause the engine to overheat & seize? That would certainly account for that sort of cost.
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Jeeps: Lego for grownups!
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