Air Conditioning problem
2001 GMC Yukon V8 Two Wheel Drive Automatic 133000 miles
----------------------------------------------------------------
When the Yukon is idling in drive the ac will not blow cold air. When get driving again the ac blows cold air fine, this is an intermitten problem. The Yukon seems to idle around 500-700, which I feel is too low.Is there some switch that is having a problem or is there a way that I can increase the idle ?

idle is about right
1st step would do check AC system if low and need a charge (134A)

check coolant fan operation 2nd
and if all ok
you may have to install Auxiliary Electric Coolant fan