I have posts on two different subject areas: SL2 Door Lock Problem and Blower Motor. I don't know how to bring the posts together. But, it rained hard today, off and on, and I put the car in my garage for approximately 5 hours to dry out so I could dig into the two problems a little more. But, mystically the door locks are working fine now in all functions and the 4th speed of my blower motor works as advertised again. HUH???????????
I don't think this is a coincidence as they both fixed themselves at the exact same time before. Where in the electrical system would the door locks and blower motor cross paths?

 

Will try to look it up tonight on generic Chilton wiring diagram

 

I still have no idea as to why my 4th speed on my blower motor stopped working and then suddenly started working again. And it's been working for a month now. Can't wait for it to come back.

 

resistor pack issue or contact issues inside HVAC head unit assuming it is physical switch or wiring at/near resistor pack is damaged, melted, intermittent connection