I Replaced the A/C fan motor on my 2003 - LS430 as it was too noisy but started facing below Issues instantly..

1. The Defrost light blinks at start up that would lock out Climate controls for 15-20 seconds...

2. The A/C inlet motors(behind the odometer/dash) operate or keep on making some adjustment on their own after switching off the ignition for about 10-15 seconds.

Did an in-dash A/C diagnosis as well as OBD-2 scan check. Both give Codes = 21/24/28
21 - is due to Solar sensor Signal
24/28 - unable to identify (need insight on these-2)

Pls HELP as this is becoming a pain during Hot climate..