Late 2009 iMac overheating


okay know system older it's in fantastic shape, bought original owner barely touched thing (came original packaging, manuals still in plastic , discs) years ago , myself have used lightly.

shortly after bought noticed if used long period of time , without warning shut down. later found out hard drive dying , needed replaced.

fixed problem , it's ran beautifully since until yesterday is.

i've been working on data entry work, had safari open google sheets running couple tabs of research stuff , youtube playing in background.

yesterday ran 5-6 hours before , without warning shut off.

touching upper left corner , realized super hot, figured had going on poor old girl , left off night cool down.

booted afternoon continue work , again had youtube running in ground today got work maybe hour, hour , half before shut down again.

suggestions cool poor thing down can use without randomly shutting off on me?
 

take apart again, blow out dust, make sure fan running , not seized up.
 


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