Why does the belt tensioner rattle when ever I turn on the A/C?

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One Tight Teal green 91 RS (my first car
All Rustangs suck!!!!
5.0 TBI with Auto trans
Z-28 wheels
K&n with dual snorkel intake
Tx Smog Pump Delete option
Rapid Fire plugs with Accel ignition wires,coil,cap and rotor
Flowtech headers with flowmaster and Half way cutout
B&M shift kit with trans cooler and hurst hotshift fulid
Hypertech thermomaster chip
96 LT1 cam
All the free TBI mods

Probably because it's been loaded down by the compressor. You might want to replace it.

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92' Camaro RS 305 TBI
Best 1/4 mile - 14.6 @ 96 mph w/NO NOS
Best 60' - 1.9 secs
Check it out
https://www.thirdgen.org/rides/index.tgo?action=view&rideid=4860

mine too. ac compressor may be dying and giving more load. or you might have a bad bearing or something in the tensioner. mine has done it for quite a while, but no problems yet. year and a half maybe. however it makes my engine sound real crappy if i turn on the ac. hehehe.

Mine does at idle in park or nuetral. I took it to a shop and the replaces the spring or the bearing or something like that. It made the sound go away.....for a day or two. I dont run the ac when i am around people.