Likely the blower motor is bad, causing increased current and blowing the fuse. Replace the blower motor.
You might just need a new flasher or a fuse.
You might check with an auto store or a GM dealer's service dept. to find out for certain but mine is a 1995 Skylark with a 3.1 V6 and it uses a timing chain.
Not sure, but you might find an old Chiltons manual on Amazon or Ebay.
You might try Chilton's or Haynes manuals. Amazon or Ebay has them dirt cheap.
I had the same problem with my 90 buick century, Replacing the temperature sensor did the trick, it is located above and behind the water pump.
My first thought was there might be a fuse that controls it but I would contact a GM Dealer's service department if I were you.
If it's the lock itself and not the latch, you might as well replace the lock.
Most auto glass companies can probably get that for you, but if they can't you might need to start contacting wrecking yards.
Try a Auto Salvage yard an you might get lucky. Might find one on Ebay. You can also just buy a generic one and use it.
it might be a horn relay switch or a wire or simply check related fuses in the compartment.
It might be a MAP sensor, EGR valve or something like that. Maybe a vacuum leak.
You might just have to replace the flasher. Check the fuses and the bulb's contacts too. How that tan-colored garbage gets in there, I'll never know.