AC was recharged now my car overheats? What can I do to fix this issue?

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My 2005 Chevrolet Classic air conditioner was recently recharged (now my air conditioner blows cold air), but a day or two after the air conditioner was recharged, my car started to overheat. I don't see any obvious leaks, I hear the cooling fans kick in but I'm at a loss. When the engine is at normal operating temperature, the top radiator hose gets hot, but the lower hose doesn't. Could it be a bad a coolant temp sensor, air in the cooling system, clogged radiator or clogged condenser fins, or could be a faulty water pump? any helpful suggestions.