it is located just below the driverside exaust manfold, in the engine block between the first and second cylinder, looks just like a temp sensor but has a single wire connector going to it,
I don't have the Formula AT, just a 1987 Firebird with 305. The relay is located on firewall drivers side. There are 2 that look similiar. Go to this web site for a picture and part number. http://www.rockauto.com/ref/ACDelco/Detail.html?15-8333.jpg or this site to do further searches on the car. http://www.rockauto.com/dbphp/mak,PONTIAC,1987,FIREBIRD+TRANS+AM,1251436,5.0L+305cid+V8+4BBL+(H),ELECTRICAL-SWITCH+xxampxx+RELAY why the relay? check the fan temp switch on the right lower engine block.
It is either the fan switch , fuse ,or the fan itself . Start by checking the fuses . Look in owners manual for fuse location . If the fuse is good have someone check the fan by wiring it direct to battery . If fan is good it has to be the fan switch . Some are in the radiator some are on the engine usually a round switch by the thermostat .