How To Check Ac Clutch Relay. I have laid in the floorboard and checked every fuse with a test light. One of the most obvious signs that the AC relay may have a problem is that the compressor is not coming on at all.
If I apply power to the greyblack wire at the clutch relay the clutch kicks on. Using a 12-volt test light connect the alligator clip to the negative terminal on the battery. Locate the air conditioner clutch relay by tracing the wire connection from the air conditioner compressor plug-in to the relay.
Bench testing the Ford 4 or 5 pin relay is not hard to do at all and in this article Ill show you how to do it there are two articles in site about bench testing a Ford relay you can find the other here.
These relays like the one in the photo in the image viewer are used in the majority of Ford vehicles. If I apply power to the greyblack wire at the clutch relay the clutch kicks on. In a few cases the clutch does not engage due to a clogged refrigerant circuit. Look on the side of the relay case.
