Belt vibration with Sanden compressor

[coupe5.0]

I have an annoying belt vibration off idle with the a/c on, then it goes away. Most of the sanden conversions i have seen do not have the extra fixed idler, only the adjustment idler like I am running. Do i need to order the fixed idler to get rid of it, or is there another way? Thanks



pic, classic auto air conversion...
fon1 pictures from trucks photos on webshots

 

[rbohm]

you need to add an idler pulley.

 

[2+2GT]

Ford had the same problem with 65-66 AC, and they would quietly add an idler if the owner complained. This idler is still available. In 67 on, they all had one.

 

[coupe5.0]

I just think its strange that I dont see the extra idler much, especially with the Sanden. Maybe they all dont do it as bad or people just put up with it, but mine is very annoying. Gonna get one ordered.

 

[CraigMBA]

Mine never vibrated. Wonder why yours does?

 

[coupe5.0]

Dont know, kinda hoping to get some opinions on it, i dont think ive ever seen a sanden with the additional idler...