you replaced the CIU? the one behind the glove box? that should have no impact on the steering system. Or was it the VCM that got replaced? sounds to me like the steering angle sensor is out of calibration, but with ought having a scanner hooked up i cant tell for sure.
Its weird that water would cause the HVAC curtain to not move, does it function normally when its dry and you get air from all the vent positions?