Second generation Toyota Prius does not come with a good air filter for the battery cooling fan, this can lead to buildup of dust or hairs especially if you travel with a pet. Therefore it is recommended to clean the fan every 50,000 miles. This guide will help you clean the fan yourself and saving upward of $300 service cost.
Lets be clear, this is not going to be a simple task. You may need a number of tools to remove the screws and clips before getting anywhere near the fan. Basic hand tools will do, but having a power tool can save you time.
Start by removing the trunk mat and privacy cover.
Now remove the trunk cover.
Remove the battery cover on the right side and the large bin in the center.
Pull out the plastic trim piece which is held in place by 4 clips. You may need to apply stern force.
Now, put down the back seats and remove tie-down bolts on the cover over the battery pack. After removing the bolts, pull up the big cover which is held in by clips and Velcro straps. Its best to have replacement clips on hand as some might break.
Remove two black screws, a chrome screw and a plastic clip. Before removing the cover, you will have to remove the trim piece beside rear seats by pushing it up from bottom and pulling it outwards from top at the same time.
Now remove the entire side panel which is held in place by clips. Then remove 2 plastic clips on the battery pack, unplug the relay and finally pull out the duct from the fan.
Next you will need to remove the duct on the top, to remove it you will need a screwdriver with a pointy end and push the three clips in the center.
For the final step, remove the three bolts and a wire clip from the fan, also remove wire connector under the fan when taking it out.
Take out the fan and clean it with your desired method, preferably with compressed air. But if you want to go one step further, you can remove the cover of the fan by removing the five screws and clean the blades more thoroughly.