1993 chevrolet suburban a/c trouble?

[George L]

yes on my suburban,when i turn my a/c on it will cool fine,but while i am going down the road for some reason the a/c will start blowing humid warm air out then after a few minutes it will start cooling again.i do not know what is causing this.i just bought the suburban not to long ago,i charged the thing up and it blew fine for awhile then it started doing this above!!!maybe a leak?bad compressor?bad expansion valve? i dont know please help!!!!

[keith]

Hopefully when you charged the system you bled the lines first. If not, try doing that first before you start looking at the other options, less expensive.