Your passenger side fan is toast, they should both turn on and off at the same time. Take the fan off and bench test it. The electric fans have two triggers:

- When a/c pressure is above 300psi, the fans are turned on at low speed. This is accomplished by a switch on the receiver dryer. There are two switches on the dryer, the fan switch is the one with pigtail leads. Remove the harness and short the harness leads together. That should start the fan. If not, the most common problem is the fan resistor, on the inner fender near the dryer.

- When engine temperature is above 105. This can be triggered one of two ways, I'm not sure which applies to your model. (1) There may be a three way temperature switch on the engine water outlet. If so, then you can test by shorting the top two contacts together. (2) Later models used a temperature sensor which feeds the HVAC head unit. The head unit then manages the fans. I'm not sure of the test procedures for this version, but it should be in the archives somewhere.

As mentioned, the primary cooling fan may also be a problem, and you may need a new fan clutch.