Method and apparatus for servicing air-conditioning systems employing electronic processing means for initially diagnosing the air-conditioning system and, thereafter, if tests or repairs are needed, for guiding the mechanic to correction of its defective operation and for charging the system with refrigerant...http://www.google.fr/patents/US4755957?utm_source=gb-gplus-shareBrevet US4755957 - Automotive air-conditioning servicing system and method
Automotive air-conditioning servicing system and method
