intermittent a/c failure

[landyacht33]

hi yall
96 volvo 850 turbo wagon
My a/c works good most of the time as long as the onboard outside thermometer doesnt go above the mid 90's. once the temps do get over the mid 90's the a/c will intermittently fail. everything will be fine until you stop moving, it will work while stopped but once you start moving again the system starts blowing warm air and smells a little musty. if you turn the switch for the system on and off several times the a/c will suddenly blow cold again. when the temps outside are under the mid 90's the a/c blows cold enough where you have to turn it down after a few minutes of use. any ideas would be appreciated.
thanks
Adam T

[vjaneczko]

Check the gap on your compressor clutch.

Read the two posts provided by Lee which you can find here:
https://www.matthewsvolvosite.com/forums ... 9&start=24

[landyacht33]

ok thanks ill tackle this next