Whistling/Squeaking in far right panel vent?

I had the same problem. Its the fan motor, mine was replaced under warrenty. But you have an 05 so I guessing yours is up.

 

Im not sure if we are having the same issues, mine seems to sound like a slight ticking sound. It might be that the fan (access through Glove Box)is out of balance. If thats the case there are screws that you can tighten or loosen to balance it out.
Read through this thread and see if it helps:
http://www.tacomaworld.com/forum/technical-chat/16437-cabin-air-filter-causing-weird-noise.html

 

mine sounds like crickets chirping in the night

 

whoo,i thought mine was from all those m&m's my boy dropped in there!

 

I'm have this exact same problem. Mine sounds like crickets too but only on the first two settings for the heater.

 

Same here, getting my blower motor replaced under warranty by the dealer.

 

same problem here too, mine makes the quiet ticking noise with the heater or the a/c. if i blast the air for a couple seconds it goes away, but starts up again a few minutes later. has anybody fixed this yet???