95 Aurora Overheating Problem - HELP

95 Aurora-Never have had overheating problem with car (103K miles) drove to local store (1 mile or less) temp gauge showed overheating-turn engine off message came on, shut it down & let it cool-no heat coming out of vents inside (turned climate control to 90) checked and there is antifreeze in the reservoir, no visible leaks. Cooling system was flushed & refilled by dealer at 85K. Does anyone know what the problem could be?
Thanks

Broken water pump belt?

burnt out fan relay?

It was the water pump belt - replaced it running as great as always---Thanks for the help...........95AURORAMAN

I love it when they are cheap and easy! lol

I also had a overheating problem,
It turned out to be the left oxygen sensor, it was bad.
I hope this will lead you somerwhere.

good luck!