Join Date: Aug 2014
Location: I live in sunny Western Colorado (Grand Junction)
AC/Power Steering Serpentine Belt - '91 S4
I imagine this has been discussed, but was unable to find a thread, so my apology if this is "old" subject....
When I operate the AC on my Spider, the belt slips at low RPM (Likely also slipping at higher RPM, but don't notice the resistance in steering effort at speeds above 25-30 mph). The adjustment is maxed out, so I purchased a new belt . . . . part # 25-050570 from NAPA which fits, but also slips. Once again the adjustment is maxed out, I can't do any better than maybe .5"-.75" deflection of the belt. I tried the next shorter belt from NAPA, but it's absolutely too short. Lengths are 1462mm (Too long) . . . and 1338mm (Too short) . . . .
I've owned the car for a bit less than a year, and previous owner said he had AC charged, and it seems to operate as designed . . (Blows cold air without drama or noise). I'm beginning to suspect that a new belt was installed at the time of service and recharge. (The one I changed out thinking the belt was worn rather than too long as it now appears.)
Now for my question:
Is there a U.S. domestic belt that is intermediate length that will work better. Also, is it possible that folks who serviced the system "overcharged" creating excessive torque requirement at the compressor?