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This paper will overview the system level testing of the Passive Thermal Control System (PTCS) for the Space Station Freedom (SSF) and highlight the design concepts that have evolved from the testing. The specifics of several system level tests, simulations and prototype will be discussed in detail. A series of development tests have been conducted under simulated space environments and operating conditions to verity the PTCS design, which is an essential component in ensuring the survivability of the Space Station Freedom in the hostile space environment for a mission life of 30 years. The Passive Thermal Control System is required to maintain the interior surface temperatures above 60°F (15.6°C) to prevent condensation and below 113°F (45°C) to protect the crew. In addition, the PTCS design must satisfy a thermal temperature range requirement of −250°F to +300°F (−156.7°C to 148.9°C) and a acceptable thermal leak requirement from the pressurized modules.