A service tray for a thermal management system for providing convenient access to components within a liquid thermal management system. The service tray for a thermal management system includes a chassis with an opening and a support unit slidably positioned within the opening. The support unit receives various thermal management devices such as a coolant pump, a filter, a heater and the like. A first rail and a second rail are attached within the interior of the chassis that movably receive a first guide and a second guide of the support unit respectively. Electrical and fluid connectors attached to the chassis and the support unit allow for the connection of the thermal management devices on the support unit to the chassis.