automatic test equipment is disclosed including a console and a testhead cooled by a hybrid cooling system . the testhead includes a card cage assembly having a plurality of slots disposed in spaced - apart relationship and adapted for receiving a plurality of electronic board assemblies . the hybrid cooling system includes a first cooling assembly coupled to the card cage assembly for distributing a first cooling medium proximate the electronic board assemblies and a second cooling assembly . the second cooling assembly is disposed proximate the card cage assembly and includes user - activatable cooling ports for selective access to a second cooling medium for the electronic board assemblies .