Lexus Troubleshooting Questions? Ask a Lexus Expert
I would suspect that you have a locked up pulley that's powered by the drive belt. Since you have a new fan bracket and a new P/S pump, I would suspect that the A/C clutch/compressor locked up, the Alternator,the Idler or the Tensioner. See attached image for there locations. Check each of these to see if you can rotate then by hand.
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If you need further assistance let me know and I would be happy to help.