z23 heat dissipation unit

The z23 heat dissipation unit was a Sienar Fleet Systems product designed to control the temperatures within modified AT-AT Dune Walkers for missions over desert terrain.

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Sources

•  Star Wars Customizable Card Game — Special Edition Limited Card: Dune Walker (backup link) (First mentioned)
• The New Essential Guide to Vehicles and Vessels
• All Terrain Armored Transport (AT-AT walker) in the Databank (original site is defunct)