Inspect the area around your battery, mainly the battery tray. If you see an abnormal amount of corrosion then the "vacuum reservoir" line may have been eaten by battery acid. The line is routed from the check valve on the drivers side of the vehicle to the right side fender passing under the battery tray. Since the 124 body followed the 123 body in numerical order it was only natural to have a problem jump the evolution chain. The good news is that only 1 line can become infected/affected by the dreaded Acid Plague!

For the blower motor issue you might want to double check the external strip-fuse, a 30Amp. CAUTION: You may receive the 80 Amp strip fuse by mistake, always confirm the rating prior to installing the replacement fuse.

I have a few other thoughts but I’ll wait for a reply on the condition of the fuse before sharing those with you.