Possible Checkups
Radiator Cap.....(Yea They Can Mess And Let You BURN In heat)
Auto Fan Switching Issue (Check System Integrity By COnnecting And Disconnecting The Switch And Check By Triggering Them While Car is parked) As You Said You Do Check It Means Its Working Fine...
Air Trapped.....Sometimes Air Trapped In System Due To Low Coolant Or Any Other Reason Can Make Car Overheat.......Make Sure There's No Air Trapped.....Bleed It....Should Have Bleeder Nut On Water Flange Side...
Gasket Issue.....For 32k Km......If You Didn't Overheat it before......Or You Are Not Unlucky...Chances Are Its Fine......Its The last Thing To Go......
Blockage In Coolant System...Possible Chances Are Coolant Is Not Flowing In System Correctly Causing The issue.......Can Be Radiator As Well....If Something Real Bad Is Deposited Inside Causing A Blockage..... Check With Thermostat Also And Make Sure Its Opening On Operating Temp
Mostly Its Something In These Issue.....Since Car Is Not So Much On Miles...I Suggest To Stick To Small Things Which Can Solve Your Issue....!
After How Long It Gets Heatup...And How Much Temp Raises.......??