For the wiper you need to make sure the nut is tight. If it is you just need to bend it. Details are here (They call it a temporary repair but it has been temporary on my cars for several years):

http://volvospeed.com/wiperarm.php

The reverse lights are likely getting ready to be a bigger problem, the PNP switch. Try "rowing" the shifter back and forth from low to park 15 or 20 times in quick succession. As it gets worse you will start to get the flashing up arrow on the instrument cluster and the transmission will go into limp mode. Rowing the shifter back and forth will sometimes clean the contacts on the switch.

For the EVAP error check the lines from the fuel tank to the cannister and also from the cannister to the purge valve. Another common problem is a leaky seal on the gas cap.

The best fix for the airbox thermostat is to throw it away and find something to jamb the flapper door to the cold air side it will never cause a problem again. That said, when the car is hot, remove the air filter and look at the flapper door - it should be directing air fully from the cold air side.

...Lee