why is there no power going to the ac compressor in my 1997 ford expedition
First thing I'd check is the fuse. If it's blown replace it with one that haswas THE SAME AMPERAGE as the old one. The amperage is the number printed on the fuse (10, 15, 20, etc.). If the new one blows you have a problem that needs to be addressed by a repair facility. You can also check the 2 wire plug that plugs into the compressor. It's usually next to the pully. If it's the blower that's not working, same deal. Check the fuse first. HTH. -Jim
Almost forgot, you may also be low on refrigerant. This condition will prevent the compressor from working too. If that's the case, off to the repair facility.
Another thing to check if the fuse is good, is the clutch cycle switch, its only about $16-$20 to try before you spend megabucks at a a/c repair shop and its no harder than a spark plug to change. It looks like this: http://images.oreillyauto.com/parts/img/large/mot/yh592.jpg
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