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Is it running hot? is the check engine light on and if so what codes does it have? Was the fan coming on and off before you replaced the radiator?
The P0052 is a O2 sensor code but the P0691 is P0691-COOLING FAN 1 CONTROL CIRCUIT LOW.P0691-COOLING FAN 1 CONTROL CIRCUIT LOW.
I attached the test for the code in which you will need to run to find the issue.. It has the wiring also to help you in repairing the fan issue..
I hope this helps,