System Performance Test. Buick Century (China) 2000

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2000 🢒 Century (China) 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 System Performance Test

Important: Record the relative humidity and ambient temperature conditions at the time of the test.

Park the vehicle inside or in the shade. The ambient temperature must be at least 16°C (60°F).
Open the windows in order to ventilate the interior.
Vent the engine exhaust.
Open the hood and install the high and low side pressure gauges.
Record the ambient temperature outside.
Record the relative humidity. Use a psychrometer or consult the local weather bureau.
Close the doors and the windows.
Set the A/C control assembly to outside air mode with the blower speed set to high and the temperature to full cold. Push the A/C button in order to turn on the A/C.
Open the A/C air outlet deflectors.
Place a thermometer in the right center A/C outlet.
Place the transaxle in PARK and start the engine.

Stabilize the engine at 2000 RPM.

Run the A/C system until the outlet air reaches the lowest temperature (about 3 minutes).
Record the outlet air temperature and the high side and low side pressures.
Turn off the engine and compare the readings with the upper limit data in the A/C Performance Table. A normally operating A/C system should not exceed the levels shown.
If the readings exceed the table limits. Refer to VDOT Air Conditioning (A/C) System Diagnosis .
If the reading are under the table limits. Refer to Refrigerant System Checks .

Relative Humidity (%)	Ambient Air Temperature		Maximum Low Side Pressure		Engine Speed (RPM)	Maximum Right Center Air Outlet Temperature		Maximum High Side Pressure
Relative Humidity (%)	°F	°C	PSI	kPa	Engine Speed (RPM)	°F	°C	PSI	kPa
20	70	21	37	255	2000	46	8	248	1710
	80	27	37	255		47	8	303	2069
	90	32	37	255		53	12	358	2468
	100	38	38	262		54	12	358	2268
30	70	21	37	255	2000	48	9	264	1820
	80	27	37	255		50	10	314	2165
	90	32	39	269		57	14	374	2579
	100	38	43	262		60	16	396	2482
40	70	21	37	255	2000	49	9	286	1972
	80	27	37	255		53	12	336	2317
	90	32	42	290		60	16	391	2696
	100	38	49	338		66	19	435	2999
50	70	21	37	255	2000	51	11	303	2069
	80	27	39	269		56	13	352	2427
	90	32	46	317		63	17	413	2848
	100	38	55	379		72	22	*	*
60	70	21	37	255	2000	53	12	319	2199
	80	27	42	290		59	15	374	2579
	90	32	49	338		66	19	429	2958
	100	38	60	414		78	26	*	*
70	70	21	37	255	2000	55	13	336	2317
	80	27	45	310		62	17	391	2696
	90	32	53	365		70	21	446	3075
80	70	21	41	283	2000	56	13	352	2427
	80	27	48	331		65	18	407	2806
	90	32	57	393		73	23	*	*
90	70	21	45	310	2000	58	14	369	2544
90	80	27	52	359	2000	68	20	424	2923
* A/C compressor turns OFF due to excessive High Side Pressure