How can I tell if fan between front and rear bay is working?

hi all
How can I tell if fan between front and rear bays is working? I put my hand behind G4 MDD to feel for air flow and it seems minimal. I hear a wind tunnel sound but I feel more heat than air flow. Please help as I don't want my Mac to overheat
Thanks, Web dude

You can run your mac with the side "door" open - down flat to the right of the computer. You should be able to see the fan do (or not do) its thing.
I have done this (run the mac with the side open) many times. For safety, I turn the mac off before opening / closing the door.

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