Look under the hood near the battery for the fuse box. The relay should be a large relay near the front of the car. Usually numbered 301 or 303 (One is for low speed fan and the other is for high speed cooling fan)

Check your owner's manual. My 2000 Taurus manual lists the location of all the relays and fuses in the under hood power box.

Another interpretation...

Just in case the question is about the fan *inside* the van for the heating and cooling - the blower... See "Related Questions" below

Related Questions

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