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An electronics cooler using reflux heat rejection and phase change material (PCM) energy storage has been built and tested. The cooler provides thermal control for an electromechanical actuator motor drive. These aircraft actuator motor drives do not have an available high performance heat sink, and thus must rely on the quiescent air in an actuator bay or the aircraft structure, as heat sinks. Thermal loads on the power electronics of these motor drives can be quite high for short durations, suggesting the use of phase change energy storage to store the heat until it can be rejected to the available heat sinks. The present experiment used Fluorinert®1 compound FC72®2 for the refluxing fluid, and Shellwax®3 paraffin wax with either a 51° C or 61° C melt temperature as a PCM for high power transients.