AC on my 94 Toyota pick up

I have a 94 toyota pick up automatic and my ac works great while I am driving. As soon as I come to a stop light
and I am sitting and waiting for it to turn green. The ait still blows from my ac but it isn’t cold. Any ideas ??
My truck works great it has about 210,000 miles.

Check to see if the cooling fan is pulling a good amount of air when idling. See if there is any debris or trash blocking the condenser coils in front of the radiator. You may need a new fan clutch to improve the amount of air coming across the condenser coils in front of the radiator when you’re stopped.