RE: P30 Chevrolet - Auxiliary fan relay location
Can't help you on the location as my P30 is a 1995, but I never heard mine come on either so I just used a jumper wire to make sure the fan DID work.....it did. So I put a switch on the dash and used an in-line fuse and now I can turn it on or off with the switch. Note: I hooked the power wire to one of the accessory plugs so after I turn the engine off the fan will also shut off, in case I forget to turn it off.
Maybe this will help.