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The fan is not supposed to be engaged all the time. The clutch inside those is awash in a temperature sensitive silicone gel , when it hot gets due to hot radiator air blowing on it the silicone gel "locks" up and makes the fan spin. If its not locking up and spinning even thought the motor gets hot , I'd take that to mean the radiator may be at fault. If the radiator were more accessable , I'd say put your hand on it (be careful) in various places , and if you feel any cold spots that indicates a blockage. If the inlet side is hot , but the outlet side is cold , that indicates a major blockage.
Since you've replaced all the other components generally known to go wrong , I'd be suspecting the radiator.
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