I had to check my relays for our a.c. clutch and you can test them by simply switching them out with another relay of the same type. I don't have the diagram on me but if you can post a picture of the relay/fuse box under the hood I can point our the clutch relay and the horn relay (they are the same and can be switched out for testing). First things first though if the blower is not worming and you have checked fuses and such the blower should blow no air with any of the vents, but that is a given I guess... I would take out the blower (I think it's in the dash by the passenger side) and connect it to power and see if it spins