Hello All - The A/C on my Blazer functions normally until the outside air temp reaches 80 - 85 degrees, at which point the compressor must be turning off because the air being blown into the vehicle is no longer being cooled. This situation can be temporarily corrected by turning the fan speed selector to its highest setting. Cold air will then flow once again, but a few minutes later the air ceases to be any cooler then vent air. At this point the A/C must be turned off for a few minutes before it will blow cold air again. Any suggestions??

you might have a short in your ac switch. I had this problem

No, he needs to go get his AC recharged again.

My 96 Blazer does almost the same thing, blowing cold then by itself not working (normal warm air blowing) and then without me doing anything, start cooling again after 1-20 minutes! Usually at temps above 85 F. Not only that, the fan vent will switch from compartment to defroster and back randomly. Did you find a cure?

My 96 Blazer does almost the same thing, blowing cold then by itself not working (normal warm air blowing) and then without me doing anything, start cooling again after 1-20 minutes! Usually at temps above 85 F. Not only that, the fan vent will switch from compartment to defroster and back randomly. Did you find a cure?
I have that same problem but I have narrowed it down to a vacum leak, the vents are vacum driven and it will fluctuate with the engine rpm's.

blowing cold and air direction in the cab are two different things.

First of all, get the cooling system rechanrged.

Second, check for vacuum leaks in the switch assembly and the vacuum ball under the hood.