When I set the AC on, the temperature rises above half the normal range. Why? on 2006 Isuzu i280 Pickup

The pickup truck is an Isuzu i280, model 2006.

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2 answers
As long as it's not overheating should be ok. Check fan,radiator,and condenser
clean as needed. Some vehic.have electric fans as well to help when ac on.
Check for that and see that it comes on with ac.Does it run cooler at say 55 mph?
ck cooling fan operation to start with