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Your 4.5 should NEVER get to the red. If it gets halfway between 212 and the redzone, I'd shut it off. Pretty sure that's how my old cams got fried (literally). Your fan clutch may not be working. Your radiator probably is scaled to kingdom-come. Your block almost surely has a ton of crud blocking coolant flow. Your water pump fins may be gunked closed or corroded off. Whatever the case is, service that system!!
The fan should come on any time the A/C is on regardless of engine temp, and any time the engine hits 212°F or more. There's a water temp sensor with a 1-prong plug to the right of the air intake mount, as facing the engine. Short this on the (-) (anywhere on the body will do) - if the fan doesn't come on, either your fan fuse is corroded or blown, the relay's shot, or the fan is bad. If it does, this sensor is shot.
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Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T
Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k
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