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The purpose of this SAE Recommended Practice is to establish uniform test procedures for measuring and rating air delivery and cooling capacity of truck and off-road self-propelled work machines used in earth moving, agriculture, and forestry air-conditioner evaporator assemblies. It is the intent to measure only the actual cooling capacity of the evaporator. It is not the intent of this document to rate and compare the performance of the total vehicle air-conditioning system.

The purpose of this SAE Recommended Practice is to establish uniform test procedures for measuring and rating air delivery and cooling capacity of truck and off-road self-propelled work machines used in earth moving, agriculture, and forestry air-conditioner evaporator assemblies. It is the intent to measure only the actual cooling capacity of the evaporator. It is not the intent of this document to rate and compare the performance of the total vehicle air-conditioning system.

The purpose of this SAE Recommended Practice is to establish uniform test procedures for measuring and rating air delivery and cooling capacity of truck cab air-conditioner evaporator assemblies. It is the intent to measure only the actual cooling capacity of the evaporator. It is not the intent of this document to rate and compare the performance of the total vehicle air-conditioning system.

This SAE Recommended Practice provides a defrosting system performance guideline for trucks, buses, and multi-purpose vehicles when tested according to SAE J381 MAY84. It is limited to results of tests that can be conducted in commercially available laboratory facilities. The current engineering practice prescribes that for laboratory evaluation of defroster systems, a known quantity of water shall be sprayed on the windshield to form an ice coating and then melted by the defroster under specific vehicle operating conditions. The procedure described by SAE J381 MAY84 provides uniform and repeatable laboratory test results, even though under actual conditions such a coating would be removed by scraping before driving the vehicle. The performance obtained, therefore, does not directly relate to actual driving conditions, but serves as a laboratory performance indicator for comparing test results within or between systems.

This SAE Recommended Practice presents minimum de frosting system performance requirements for trucks, buses, and multi purpose vehicles when tested according to SAE J381. It is the intent that this performance standard will be reviewed and revised to reflect technological progress in vehicle defroster systems.

This SAE Recommended Practice establishes uniform test procedures and minimum performance requirements for windshield wiping systems and wiper blades of trucks, buses, and multipurpose passenger vehicles. The evaluation procedures include those tests that can be conducted on uniform test equipment by commercially available laboratory facilities. Besides the terminology included in paragraph 2, uniform terminology of windshield wiper system characteristics and phenomena may be found in SAE J903. Also included are guides for the use of engineering layout studies to evaluate system performance. The test procedures and minimum performance requirements, outlined in this recommended practice, are based on currently available engineering data. It is the intent that all portions of the recommended practice will be periodically reviewed and revised as additional data regarding windshield wiping system performance are developed.