Nissan Sentra B18 (2020-2025) Service Manual: Inspection

Nissan Sentra B18 (2020-2025) Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning System :: Periodic Maintenance / Performance Test / Inspection

Inspection

INSPECTION PROCEDURE

Connect recovery/recycling/recharging equipment (for HFO-1234yf) or manifold gauge.

Start the engine, and set to the following condition.

Test condition
Surrounding condition		Indoors or in the shade (in a well-ventilated place)
Nissan Sentra Vehicle condition	Door	Closed
	Door glass	Full open
	Hood	Open
	Engine speed	Idle speed
A/C condition	Temperature control switch or dial	Full cold
	A/C switch	ON
	Air outlet	VENT (ventilation)
	Intake door position	Recirculation
	Fan (blower) speed	Maximum speed set

Maintain test condition until A/C system becomes stable. (Approximately 10 minutes)
Check that test results of “recirculating-to-discharge air temperature” and “ambient air temperature-to-operating pressure” are within the specified value.
When test results are within the specified value, inspection is complete.

If any of test result is out of the specified value, perform diagnosis by gauge pressure. Refer to Symptom Table.

RECIRCULATING-TO-DISCHARGE AIR TEMPERATURE TABLE

Inside air (Recirculating air) at blower assembly inlet		Discharge air temperature from center ventilator °C (°F)
Relative humidity %	Air temperature °C (°F)	Discharge air temperature from center ventilator °C (°F)
50 – 60	20 (68)	4.7 – 6.7 (40 – 44)
	25 (77)	8.6 – 11.1 (47 – 52)
	30 (86)	12.6 – 15.6 (55 – 60)
	35 (95)	19.0 – 22.5 (66 – 73)
60 – 70	20 (68)	6.7 – 8.7 (44 – 48)
	25 (77)	11.1 – 13.6 (52 – 56)
	30 (86)	15.6 – 18.6 (60 – 65)
	35 (95)	22.5 – 26.0 (73 – 79)

AMBIENT AIR TEMPERATURE-TO-OPERATING PRESSURE TABLE

Fresh air	High-pressure (Discharge side) kPa (kg/cm², psi)	Low-pressure (Suction side) kPa (kg/cm², psi)
50 – 70	25 (77)	909 – 1,112 (9.2 – 11.3, 131.8 – 161.2)	159 – 194 (1.6 – 2.0, 23.1 – 28.1)
30 (86)	1,073 -– 1,312 (10.9 – 13.4, 155.6 – 190.2)	211 – 259 (2.2 – 2.6, 30.6 – 37.6)
35 (95)	1,445 – 1,766 (14.7 – 18.0, 209.5 – 256.1)	247 – 300 (2.5 – 3.1, 35.8 – 43.5)
40 (104)	1,650 – 2,017 (16.8 – 20.6, 239.3 – 292.5)	290 – 355 (3.0 – 3.6, 42.1 – 51.5)

Fresh air

High-pressure (Discharge side)

kPa (kg/cm², psi)

Low-pressure (Suction side)

kPa (kg/cm², psi)

Relative humidity

Air temperature

°C (°F)

50 – 70

25 (77)

909 – 1,112

(9.2 – 11.3, 131.8 – 161.2)

159 – 194

(1.6 – 2.0, 23.1 – 28.1)

30 (86)

1,073 -– 1,312

(10.9 – 13.4, 155.6 – 190.2)

211 – 259

(2.2 – 2.6, 30.6 – 37.6)

35 (95)

1,445 – 1,766

(14.7 – 18.0, 209.5 – 256.1)

247 – 300

(2.5 – 3.1, 35.8 – 43.5)

40 (104)

1,650 – 2,017

(16.8 – 20.6, 239.3 – 292.5)

290 – 355

(3.0 – 3.6, 42.1 – 51.5)

Performance Test

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