Subaru R-134A Performance Testing, Test Conditions, Subaru Air Conditioning Systems, End Wrench

Subaru Air Conditioning Systems

Fill the compressor with the proper amount of the correct type refrigerant oil.

	Use of the incorrect type of compressor oil may result in damage to the com-
	pressor. Refer to Subaru Service Bulletin number 10-37-84, dated 12-12-84, for
	compressor oil specifications for Matsushita (Panasonic), Hitachi, Lone Star and
	other compressor types. Always manually rotate the compressor several turns to
	confirm proper operation after filling with refrigerant oil.
	Note: The variable displacement Calsonic and DIESEL KIKI compressors
	may only be filled with special V-5 compressor oil, (D-9OPX). Any
	contamination with other types of compressor oils will cause
	compressor damage. Never substitute or cross-contaminate R-12
	compatible compressor oil with R-134a compatible compressor oil.
Oil Refill	Refer to the Oil Charge Table found in Section 4-7 of the appropriate model
	year Service Manual. This can be a useful tool to determine the proper procedure
	to follow and to determine the amount of refrigerant oil to add or replace to the
	compressor after servicing, repairing, or replacing major system components.
	Always manually rotate the compressor several turns to confirm proper operation.

Performance Testing

Test Conditions

•The vehicle must be indoors or in the shade.

•Doors should be closed, all windows open.

•Hood open.

•Connect the manifold gauge.

•Set the mode switch to the A/C MAX position. (On variable displacement compressor system set the A/C controls to high blower and normal A/C.)

Note: When servicing variable displacement compressors refer to Service Bulletin, 10-52-89, dated 07-28-89, for complete compressor diagnostic information.

•Set the temperature control to COLD.

•Start the engine and idle at 1,500 RPM.

•Operate for approximately 10 minutes, then observe the high and the low pressure levels.

An essential step of the performance test is measuring the temperature of the inlet air at the blower and the temperature of the outlet air at the vent grills. The temperature difference should be within specifications for the system. System temperatures will vary with changing conditions, such as high ambient air temperature, humidity, and altitude.

Temperature Measurement

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