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1. Power door locks seldom work-same thing-occasionally on a humid day.
2. Vents do not open and close properly-feet and vents stay on always.
3. "Auto" function of fan doesn't seem to function-sometimes it does
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Firstly, buy a mity-vac or similar vacuum tester, until you do you're pissing in the wind. You pretty much need one to own one of these cars.
1. attach the mity-vac hose to the orifices on the metal or hard plastic line between the brake booster on the drivers side firewall and the vacuum pump, its the thing with all the vac lines coming off of it. You should have 20-25 inches of vac. If so just follow the lines, checking 3 and 4 way rubber connectors, orifices, dashpots (the little plastic doohickeys) as far as you can. The larger diameter yellow lines that go through the firewall are your supply lines to the locks and vacuum reservoir in the trunk, the brown line that goes through the firewall in the same place can be traced back to a fitting on the side of the injection pump, about 18 inches from the firewall. This brown line merely makes a circuit from the brake booster line(vac. supply) through the ignition switch and back out to a pod inside the injection pump. If you disconnect one of the brown lines and suck on it, it should shut the engine off.
2. There are also vac pods inside and/or behind the dash that control all the vents, they can also be diagnosed with the mity-vac, there are many threads on this forum about the subject, replacing them and/or figuring out which ones are bad can be done, buts its a pain.
3. The fan functions via a relay and temperature sensor that lives in a recess in the dead center of the dash, under a black plastic grille. Often, the insulated hose that runs between the temp sensor and the fresh air supply plenum and behind the glove box deteriorates and prevents the sensor from readily the cabin temp correctly and kicking the fan up a speed. It is easily replaced once you remove the glove box, again do a search for cabin temp sensor or something similar and you should find alot of good responses.
Good luck.