Air conditioning in Nissan Note stopped turning on and you don't know where to start? This problem occurs on both first generation models (E11, 2004–2012), and on restyled versions (E12, 2012–2020). The reasons may lie in anything: from a banal fuse blown to serious malfunctions of the compressor or electronics. In this article we will look at all possible scenarios, including those that are often missed even in service centers.

It is important to understand that the air conditioning system is Nissan Note closely related to electrical circuit, refrigerant And mechanical components. For example, if the air conditioner does not respond to the power button, but the fan works, this is one diagnosis. And if you hear a click when you press it, but no cold air comes in, it’s completely different. We have structured the material so that you can quickly identify a symptom and move on to a specific solution.

Don’t rush to take your car to a service center: more 60% malfunctions air conditioner in Note You can fix it yourself with a minimal set of tools. But there are also pitfalls - for example, on models with climate control (automatic air conditioning), the sun light sensor often fails, which blocks the system from turning on. More on this and other nuances below.

1. Checking fuses and relays: the first diagnostic step

If the air conditioner in your Nissan Note shows no signs of life, start with fuse box. In 80% of cases the problem lies here. The air conditioning fuse is usually located in the passenger compartment (under the steering wheel or in the glove compartment) and has a rating 10A or 15A. On models E11 it is designated as F37, on E12 — F20 (check the diagram on the block cover).

Also check air conditioner relay — it is responsible for supplying power to the compressor. On Note the relay is usually located next to the fuse and is marked R15 or AC Relay. Signs of a faulty relay:

  • 🔊 Clicking sound when pressing the AC button, but the compressor does not start.
  • 🔥 The relay gets hot or smells burnt.
  • 🔄 The air conditioner turns on every other time.

How to test a relay without a multimeter? Just swap it with a similar one (for example, a cooling fan relay). If the air conditioner works, the problem has been found. If not, continue to the next step.

⚠️ Attention: On Nissan Note E12 with the system Intelligent Key When replacing the air conditioner relay, an error may occur U1000 (CAN bus mismatch). In this case, errors must be reset via a diagnostic scanner.
📊 What year is your Nissan Note?
  • 2004–2008 (E11)
  • 2008–2012 (E11 restyle)
  • 2012–2016 (E12)
  • 2016–2020 (E12 restyle)
  • I don't know

2. Diagnostics of the power button and wiring

If the fuses and relays are ok, but the air conditioner still does not respond when you press the button, the problem may be:

  • 🔘 Faulty button A/C on the control panel.
  • 🔌 Broken wiring from the button to the climate control unit.
  • 🖥️ Malfunctions of the climate control unit itself (on models with an automatic system).

How to test a button? Disconnect the connector from the control panel (usually located behind the glove compartment or under the center console) and measure the resistance of the button A/C multimeter. When turned off, the resistance should be endless, when pressed - 0 ohm. If the values ​​are different, the button is faulty.

Also inspect the wires for oxidation or breakage. Pay special attention to the connector C101 (on E11) or C205 (on E12) - it often oxidizes due to moisture. To clean contacts, use alcohol or special cleaner (For example, CRC Contact Cleaner).

Check the fuse (10A/15A)|Check the relay (labeled R15/AC Relay)|Measure the resistance of the A/C button|Inspect connectors C101/C205 for oxidation|Ring the wiring from the button to the climate control unit-->

3. Problems with the compressor: why the clutch does not work

If when you press the button A/C you hear a clicking sound, but the compressor does not start, it's your fault compressor clutch or the compressor itself. On Nissan Note compressors were installed Denso (models 7SEU16C, 7SEU17C) and Sanden (models SD7H15, SD7V16). Their feature is weak coupling, which often burns or wears out.

How to diagnose:

  1. Start the engine and turn on the air conditioning.
  2. Look at the compressor pulley: if it rotates, but the central part (clutch) does not, the problem is in the clutch.
  3. If the clutch does not click at all, check the power supply at the compressor connector (there should be 12V with AC on).

Common causes of clutch failure:

  • 🔥 Burning of contacts inside the coupling (replacement required).
  • 🧲 The pulley bearing is worn out (a hum is heard when rotating).
  • 🔋 Low voltage in the on-board network (less 11.5V).
⚠️ Attention: On Nissan Note E12 with engines HR12DE And HR15DE the compressor is controlled via additional module (located next to the battery). If the clutch does not operate, check the connector of this module - it often oxidizes.
Symptom Probable Cause Solution
There is a click, but the clutch does not rotate Wear or burning of the coupling Replacing the clutch or compressor assembly
There is no click, there is power on the connector Clutch coil malfunction Replacing the coil or coupling
There is a click, but the compressor does not pump Compressor jam or refrigerant leak Pressure diagnostics, repair or replacement
The air conditioner turns on every once in a while Poor contact in connector or low voltage Cleaning contacts, checking battery

4. Freon leak and pressure problems

If the compressor turns on but no cold air comes in, there is most likely a problem in the system no refrigerant or its level is critically low. On Nissan Note freon is used R-134a (until 2017) or R-1234yf (after 2017). Normal system pressure:

  • 🔹 Low side (suction): 1.5–2.5 bar.
  • 🔹High side (pressure): 10–15 bar (with the compressor running).

Signs of a freon leak:

  • ❄️ The air conditioner blows warm air.
  • 💧 Oily spots under the car (especially in the area of the compressor or pipes).
  • 🔍 Visible damage to the pipes or radiator of the air conditioner.

Where leaks most often occur:

  1. Tube connections (especially in areas of rubber seals).
  2. Condenser (air conditioner radiator) - often damaged by stones.
  3. Compressor O-rings.
  4. Pressure sensor (on the high pressure pipe).
💡

On Nissan Note E11 Leakage often occurs at the junction of the tube and the evaporator (under the dashboard). To get to it, you will have to remove the glove compartment and part of the lining.

5. Malfunctions of sensors and climate control unit

On Nissan Note with automatic climate control (optional Auto A/C) the air conditioner may not turn on due to a malfunction of the sensors:

  • 🌡️ Interior temperature sensor (located behind the glove compartment or on the ceiling).
  • ☀️ Sunlight sensor (on the dashboard, next to the windshield).
  • 🚗 Freon pressure sensor (on the high pressure pipe).

If the sunshine sensor fails, the climate control unit “thinks” that there is bright sun shining on the car, and blocks the air conditioner from turning onto avoid overheating. You can diagnose the problem by disconnecting the sensor connector - if the air conditioner works, the cause has been found.

Also check climate control unit (located behind the control panel). On Note E12 it often “glitches” due to moisture. Signs:

  • 🔄 The air conditioner turns on spontaneously.
  • 🎛️ The buttons on the panel do not respond.
  • 🔥 An error flashes on the display E1 or E2.
How to reset climate control errors on Nissan Note?

1. Turn off the ignition.

2. Press the button AUTO and turn on the ignition (without starting the engine).

3. Hold AUTO 10 seconds until the display flashes.

4. Release the button - the errors will be reset.

Attention: On some models, sensor calibration is required after a reset (contact service).

6. Problems with the fan and evaporator

If the air conditioner turns on but the air is weak or warm, the problem may be:

  • 🌀 Heater fan (does not blow at all or blows weakly).
  • ❄️ Clogged evaporator (air blows, but does not cool).
  • 🔄 Faulty damper (the air goes past the evaporator).

On Nissan Note The heater fan is located under the glove compartment. If it doesn't work:

  1. Check the fuse F10 (20A).
  2. Make sure the fan connector is receiving 12V with the fan on.
  3. If there is power, but the fan does not spin, replace it (part number: 27310-4M000 for E11, 27310-4M010 for E12).

If the air is blowing but not cooling, the cause may be dirty evaporator. On Note it is located behind the glove compartment, and to clean it you will need:

  1. Remove the glove compartment and trim.
  2. Treat the evaporator with special foam (for example, Liqui Moly Klima-Anlagen-Reiniger).
  3. Blow out the system with compressed air.
⚠️ Attention: When cleaning the evaporator do not use water under pressure - this can damage the cells and cause freon leakage. Also avoid harsh chemicals (such as acids).
💡

If, after cleaning the evaporator, the air conditioner still does not cool, check the freon level - contamination is often accompanied by leakage through microcracks in the radiator.

7. Diagnostics via OBD-II: what errors to look for

If the self-test does not produce results, connect diagnostic scanner (For example, ELM327 or Launch CReader) and check for errors in the protocol CAN. On Nissan Note The air conditioner is connected to the blocks:

  • 🔧 ECM (Engine Control Module) - controls the compressor.
  • 🌡️ BCM (Body Control Module) - responsible for buttons and sensors.
  • 🚗 A/C Control Unit — climate control unit.

Common air conditioner errors:

Error code Description Probable Cause
P0530 A/C Pressure Sensor Circuit Malfunction Broken wire or sensor malfunction
B1413 Interior temperature sensor error Malfunction of the sensor or climate control unit
U1000 Loss of communication via CAN bus Problems with wiring or BCM
C1140 Low pressure in the air conditioning system Freon leak or compressor malfunction

If the scanner shows an error U1000, check CAN bus connections (connectors C101 And C102 under the steering wheel). On Note E12 This error often appears after replacing the battery or disconnecting the terminals.

FAQ: Frequently asked questions about air conditioning in Nissan Note

The air conditioner turns on but blows warm air. What is the reason?

Most likely in the system no freon or its level is critically low. Also check:

  • Compressor performance (should turn on with a characteristic click).
  • Condition of the condenser (air conditioner radiator) - it could be dirty or damaged.
  • Evaporator - it may be clogged with dust.

If there is freon, but the air is still warm, check thermostatic valve (on the high pressure pipe). It could jam.

When pressing the A/C button, a click is heard, but the compressor does not start. What to do?

The clicking sound indicates that the compressor clutch is trying to engage, but cannot. Reasons:

  • The contacts inside the coupling are burnt.
  • The compressor is stuck (check if the pulley rotates freely when the engine is off).
  • Low voltage in the on-board network (less than 11.5V).
  • Faulty relay or fuse.

For diagnostics, disconnect the connector from the compressor and apply it to the clutch 12V directly from the battery. If it doesn't work, replacement is required.

The air conditioner works, but turns off after 5-10 minutes. Why?

This is a typical sign system overheating or protection activation. Possible reasons:

  • Clogged condenser (air conditioner radiator).
  • Condenser cooling fan malfunction.
  • High pressure in the system (more than 25 bar) due to excess freon.
  • Malfunction of the pressure sensor (turns off the compressor if it triggers falsely).

Check the temperature of the high pressure pipe - if it is hot (more than 60°C), the system overheats.

After refilling the freon, the air conditioner stopped working. What's happened?

Probable reasons:

  • 🔧 Refueling — too much freon causes the protection to trip.
  • 🛢️ Poor quality freon - could damage the compressor.
  • 🔌 Air entry into the system when refueling (need to be evacuated and refilled).
  • 🔍 Seal damage when connecting equipment.

If the compressor does not turn on after refueling, check the pressure with a pressure gauge. Normal values:

  • Low side: 1.5–2.5 bar.
  • High side: 10–15 bar.
Is it possible to drive without freon in the air conditioner?

Short term - yes, but not recommended. Why:

  • The compressor runs dry, which leads to accelerated wear.
  • Moisture may enter the system, causing corrosion tubes
  • On models with a belt driven compressor (Note E11) the clutch will be slip, accelerating belt wear.

If the air conditioner does not work, it is better disconnect the compressor clutch (remove fuse or relay) to avoid damage.