If you haven't already, before you remove the fan, test or replace the relays that control the fans. When working properly both fans should run at the same time when they are activated at either slow or high speed. Engine temp and the ECM control their operation so they may not come on when the A/C is turned on until the air increases the heat load enough. There are three relays that control the fans. They are located in the under hood fuse block. One relay operates the right fan, a second the left and the third both at full speed. The relays switch the fans from series wired at low speed to parallel wired at high speed.
Removing the fans require taking off the upper front end support and filler plate that holds the hood latch, disconnecting the radiator and wiring then pulling the rad and fans out the top. It may be easier to remove the plastic front end and grill to get at the bad fan if that is the problem.
This watered down info comes from my C/D repair manual which I am not smart enough to truly understand but gives you some idea what may be involved. If you are going to keep doing your own repairs, the $10.00 repair C/D off EBay is worth it as it is quite detailed in listing the proper steps and has decent diagrams.
