wow, dirty little bugger. I replaced my thermostat housing and thermostat on my 04 Tj. The housing was corroded and the gasket dry rotted. The thermostat was rusted to the engine block. Dexcool was used as the 50/50 fix of coolant. Needless to say, I drained that stuff out and put in the normal stuff, cleaned up the engine block and reinstalled everything. Works great. I was going to do the water pump as well once I saw the thermostat but I didn't have the time.
If it's not bent and doesn't have sharp edges, or if you can file it down smooth to make it that way, I'd keep it. Depending on how easily you can get a replacement and how much it will cost, of course. If you can get just the pulley and it isn't very expensive then why not change it?
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