Typically both fans should turn on when the air conditioning is on. Give it a test to see if the fans work. If so, then the typical 90's overheating at idle is related to missing plastic under and around the engine compartment. Your 3rd gen has a very small grill area and chevy used plastic to sheild the engine from ground heat (when sitting still) as well as helping to route the cool air through the rad core and around the engine. I also don't see any kind of a shroud on the radiator, just the core and fans and that can cause the same problem...
Has the car been worked on recently and parts left off? Did the problem just occure?
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