At what temperature does the air cleaner temperature sensor open and close?

The sensor is closed below 38°C (100°F) and open above 53°C (127°F). It partially opens between 38°C and 53°C (100°F and 127°F) to reduce intake manifold vacuum.

What vacuum levels operate the air cleaner vacuum motor?

With the sensor closed: above 21.3 kPa (160 mmHg, 6.30 inHg) the motor raises (hot inlet air); 5.3–21.3 kPa (40–160 mmHg, 1.57–6.30 inHg) it partially raises (cold + hot); below 5.3 kPa (40 mmHg, 1.57 inHg) it is down (cold). With the sensor open, the motor is down at any vacuum value (cold air).

What components are shown on the A.T.C. air cleaner diagram?

The P.C.V. filter, air inlet for the A.B. valve, temperature sensor, vacuum motor, idle compensator, air injection valve case, air temperature bimetal, adjusting frame, air control valve, and air bleed valve.

What happens when the temperature sensor partially opens?

Between 38°C and 53°C (100°F and 127°F) the sensor partially opens so intake manifold vacuum may be reduced, causing the motor to activate and open the cold air passage wide so cold air is taken in.

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Nissan A.T.C. Air Cleaner Diagram & Operation Table - Vacuum Motor (EF & EC-6)

Nissan automatic temperature control ATC air cleaner vacuum diagram and operation table EF&EC

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Automatic Temperature Control (ATC) air cleaner cutaway/vacuum diagram and operation table: temperature sensor and vacuum-motor behavior by ambient temp, opening cold-air passage below 38C and closing above 53C.

AI caption June 2005 · Photo 106 of 412

This service manual page describes the Automatic Temperature Control (A.T.C.) Air Cleaner system, page EF & EC-6. It includes two labeled diagrams: an exploded view of the air cleaner assembly identifying the P.C.V. filter, air inlet for the A.B. valve, temperature sensor, vacuum motor, idle compensator, and air injection valve case; and a cross-sectional schematic showing the air temperature bimetal, adjusting frame, vacuum motor, cold air and hot air passages, air control valve, air bleed valve, and connection to the intake manifold. The Operation section explains that the system is controlled by inlet air temperature and engine load: the sensor detects inlet air temperature and the vacuum motor is actuated by engine intake vacuum. An operation table correlates ambient temperature at the sensor (below 38°C/100°F sensor closed; above 53°C/127°F sensor open) with intake manifold vacuum ranges (above 21.3 kPa, 5.3–21.3 kPa, below 5.3 kPa) and the resulting vacuum motor position (raise, partially raise, down) and inlet air source (hot, cold + hot, cold). A footnote explains the sensor partially opens between 38°C and 53°C to reduce manifold vacuum, opening the cold air passage wide so cold air is taken in.

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Frequently asked questions

How does the automatic temperature control (A.T.C.) air cleaner work?: It is controlled by inlet air temperature and engine load. The inlet air temperature is detected by the temperature sensor, and the vacuum motor is actuated by engine intake vacuum, which raises or lowers the air control valve to select hot air, cold + hot air, or cold air.
At what temperature does the air cleaner temperature sensor open and close?: The sensor is closed below 38°C (100°F) and open above 53°C (127°F). It partially opens between 38°C and 53°C (100°F and 127°F) to reduce intake manifold vacuum.
What vacuum levels operate the air cleaner vacuum motor?: With the sensor closed: above 21.3 kPa (160 mmHg, 6.30 inHg) the motor raises (hot inlet air); 5.3–21.3 kPa (40–160 mmHg, 1.57–6.30 inHg) it partially raises (cold + hot); below 5.3 kPa (40 mmHg, 1.57 inHg) it is down (cold). With the sensor open, the motor is down at any vacuum value (cold air).
What components are shown on the A.T.C. air cleaner diagram?: The P.C.V. filter, air inlet for the A.B. valve, temperature sensor, vacuum motor, idle compensator, air injection valve case, air temperature bimetal, adjusting frame, air control valve, and air bleed valve.
What happens when the temperature sensor partially opens?: Between 38°C and 53°C (100°F and 127°F) the sensor partially opens so intake manifold vacuum may be reduced, causing the motor to activate and open the cold air passage wide so cold air is taken in.