Hi Linda,
We had a similar problem.  We have the working fan inside the cabinet, and 2 fans (taken out of old computers) blowing onto our top fitting.  They aren't connected to the TC/EA power they just plug into the wall.  
But if you find an external source let us know!
Kim


On 10/10/14, "Reynard, Linda" <[log in to unmask]> wrote:
[log in to unmask]" class="iwcQuote" style="border-left: 1px solid #00F; padding-left: 13px; margin-left: 0;" type="cite">
Dear Isogeochemists

Has anyone replaced the lower fan in a Thermo TC/EA (12 VDC, 250 mA), the one that blows on the lower part of the column? Ours has started making a louder-than-usual noise and I worry that its days are numbered. Thermo will sell us one very expensively.

Any other sources for a replacement? If you have made the swap, how did you connect it to the TC/EA power source?

Thanks!

Linda.


------
Dr Linda Reynard
Department of Human Evolutionary Biology
Harvard University
11 Divinity Avenue, Cambridge, MA 02138 USA
tel: 617 495 8053