A few seconds after engine starts, fan starts blowing air at the max level. ***** don’t respond. Activating A/C doesn’t blow cold. It is just air that gradually becomes hotter. The compressor turns but still no cold air. I replaced the resistor blower but did nothing. I’m hoping to get some advice before continuing troubleshooting.

Thanks in advance for any helpful advice.

 

It's possible that the fan speed control potentiometer has gone bad.
Contact @tighed1 can rebuild the unit. I have tagged tighed1 in this post. Hopefully he will respond shortly.
Here are my posts on how to remove and re-install the unit:
Climate control unit removal
Climate control unit installation