Lately, when the AC is turned on, the AC radiator fan on my 2005 RL has been cycling off and on. It will run at high speed for 15-20 seconds, the turns off for 20-30 seconds and repeats the cycle. I believe this continuous on-off cycling lead to the bearing failure of the original fan motor. Last week, I replaced the bad motor but the on-off cycling still continues.

I don't believe this is normal operations and don't want to burn out the new motor.

There must be some other component or problem. Thank you in advance.