Heater motor <em>Nissan Almera G15</em>: signs of malfunction and do-it-yourself replacement

Nissan Almera G15 is a popular sedan, but as many owners age, they experience problems with the heating system. One of the most vulnerable nodes is stove motor (heater fan), which is responsible for air circulation in the cabin. Its breakdown leads to a lack of airflow, fogging of the glass and discomfort during the cold season.

In this article we will look at how to independently diagnose a malfunction of the stove motor on Almera G15 (2013–2018), select a high-quality replacement and perform repairs without contacting service. We will pay special attention typical mistakes when replacing, which lead to repeated breakdowns, as well as nuances of connecting connectors and checking fuses.

Signs of a malfunctioning heater motor

The first symptoms of a heater fan problem often go unnoticed until the system stops working completely. Here are the key signs to look out for:

• 🔊 Extraneous noise when the stove is operating: grinding, whistling or humming, especially at high speeds. This may indicate worn bearings or debris getting into the impeller.
• 💨 Weak or uneven airflow even at maximum fan speed. Often the cause is contamination of the blades or power problems.
• ❌ Complete lack of reaction to change speeds. If the stove does not turn on in any mode, either the motor or the fuse is to blame F30 (10A) in the block under the hood.
• 🔥 Burning smell from the air ducts - a signal about a short circuit in the motor winding or overheating of the brushes.

On Nissan Almera G15 The heater motor is located behind the center console, under the glove compartment. Access to it is complicated by the need to dismantle the plastic panels, but diagnostics can be carried out without complete disassembly. For example, if you hear a relay click when you turn on the stove, but the fan does not rotate, the problem is most likely in the motor itself or its connector.

⚠️ Attention: If the stove only works at 4th speed, but not at the others, it is not the motor that is to blame, but speed resistor (located next to the fan). Replacing it will be cheaper and easier.

Diagnostics of the stove motor: step-by-step instructions

Before removing the motor, make sure that this is the problem. To do this, check in the following order:

1. Check the fuse F30 (10A) in the mounting block under the hood. It is responsible for the heater fan circuit. If the fuse is blown, replace it and check if the problem persists.
2. Make sure the relay is working properly (located in the same block, usually signed as Heater Fan Relay). Try swapping it with a similar relay (for example, from the headlights).
3. Ring the wiring from the motor connector to the fuse box. Often, oxidation of contacts or broken wires leads to unstable operation.
4. Apply voltage directly to the motor, bypassing the standard wiring. To do this, remove the connector from the fan and connect it to the battery via wires with alligator clips (polarity is not important for checking). If the motor does not spin, it is faulty.

If the fan works when connected directly to the battery, the problem lies in the power circuit or speed resistor. In this case, diagnostics with a multimeter will be required:

• 🔧 Measure the voltage at the motor connector with the stove on. At speeds 1–3 there should be 5–9 V, on the 4th - 12 V.
• 🔧 Check the resistance of the speed resistor (normal: 0.5–1.5 Ohm for low speeds, 0 ohm for maximum).

Checking fuse F30 (10A)|Testing the fan relay|Testing the wiring with a multimeter|Direct connection to the battery|Checking the speed resistor-->

Choosing a stove motor: original vs analogues

On Nissan Almera G15 a heater motor with a catalog number was installed 27350-BM40A (original). However, its price often exceeds 5,000–7,000 rubles, so many owners choose analogues. The table below shows proven options indicating the average cost and features:

Manufacturer	Article	Cost (₽)	Features
Nissan (original)	27350-BM40A	5 500–7 200	1 year warranty, full compatibility, service life 100+ thousand km
Valeo	696003	3 800–4 500	High-quality bearings, quiet operation, but may not fit the connector (needs improvement)
Febi Bilstein	30520	3 200–3 900	A good budget option, but there are defective copies (check before installation)
Denso	727-8001	4 200–5 000	Japanese quality, long life, but rarely in stock
ERA	550428	2 500–3 000	The cheapest option, but the resource is limited (often enough for 1–2 seasons)

When choosing an analogue, pay attention to:

• 🔌 Connector type — in the original it is rectangular with 3 contacts. Some analogues (for example, Valeo) may have a round connector that will have to be soldered.
• 🔄 Direction of rotation — the motor should rotate clockwise (when viewed from the impeller). Check this before purchasing.
• 📏 Dimensions - the diameter of the body should be 120–122 mm, length - 80–85 mm. Deviations will lead to installation problems.

⚠️ Attention: Motors from Renault Logan/Sandero (article 27350-5M400) are similar in appearance, but have a different speed characteristic and may not work correctly on Almera G15. We do not recommend installing them.

Step-by-step replacement of the heater motor on a Nissan Almera G15

To replace the heater motor you will need:

• 🔧 Screwdriver set (phillips, flat)
• 🔨 Socket wrench on 10 mm
• 🔌 Pliers for removing clamps
• 📸 Phone for photographing connectors (so as not to get confused during assembly)

Opening hours: 1.5–2 hours (excluding diagnostics). Follow the instructions:

1. Remove the negative terminal from the battery - this is mandatory for safety.
2. Remove the glove compartment:
   • Unscrew the 2 screws at the bottom of the glove compartment (under the plastic plug).
   • Pull the glove compartment towards you and disconnect the limit cables.

Remove the lower plastic panel under the steering wheel (held on by 3 clips and 1 screw).

Disconnect the motor connector — it is located to the right of the gas pedal. For convenience, you can remove the pedal by unscrewing the 2 nuts on 10 mm.

Unscrew the 3 screws securing the motor (two on top, one on bottom). Be careful - when unscrewing the bottom screw, the motor may fall down.

Remove the motor along with the impeller and clean the seat from dust and debris.

Install a new motor in reverse order. Make sure the impeller rotates freely without touching the housing.

After assembly, check the operation of the stove at all speeds. If the airflow is weak at speeds 1–3, but normal at speed 4, the problem is in the resistor (it should also be replaced).

What to do if after replacement the motor is unstable?

If the new heater motor turns on with a delay or runs jerkily, check:

1. **Quality of contacts in the connector** - often oxidation or poor fit of the plug leads to interruptions.

2. **Voltage at the speed resistor** - it must correspond to the table:

- 1st speed: ~5 V

- 2nd speed: ~7 V

- 3rd speed: ~9 V

- 4th speed: 12 V (bypassing resistor)

3. **Ground integrity** - check the ground wire (black) going from the motor to the body. It often oxidizes near the fastening bolt.

Typical mistakes when replacing a heater motor

Even experienced car owners make mistakes that lead to repeated breakdowns or additional expenses. Here are the most common:

• 🔌 Incorrect connector connection. On a motor Nissan Almera G15 The connector has a key (protrusion), but some analogues allow you to connect upside down. This leads to reverse rotation and rapid wear of the bearings.
• 🔧 Tightening the fastening screws with force. The motor housing is plastic - with excessive force it cracks and backlash appears.
• 💨 Ignoring Air Duct Cleaning. If you do not remove leaves and dust from the stove body, the new motor will quickly clog and begin to make noise.
• ⚡ Checking operation without ground connection. The motor can spin from the battery, but when installed in a car it will not work due to poor contact with the body.

Another common mistake is buying a motor without an impeller. On Almera G15 The impeller often “sticks” to the shaft and is broken during dismantling. As a result, a new motor has to be purchased along with the impeller (part number 27355-BM40A), which increases costs by 1,500–2,000 rubles.

Prevention: how to extend the life of the stove motor

The average life of the stove motor is Nissan Almera G15 — 80–120 thousand km, but with proper care it can be increased by 1.5–2 times. Follow these guidelines:

• 🍃 Clean the cabin filter regularly (every 15 thousand km). A clogged filter increases the load on the fan.
• 💧 Avoid moisture into the air ducts. After washing, check if there is any water left under the mats - it can leak to the motor and cause corrosion.
• 🔄 Periodically turn on the stove at maximum speed (at least once a week). This prevents the bearings from souring.
• 🚫 Do not use the oven to dry things (shoes, clothes). High humidity accelerates wear of brushes and contacts.

If you often drive on dusty roads, install additional zero resistance filter in front of the standard cabin filter. This will reduce the load on the motor and extend its service life.

Also note antifreeze quality. If there is sediment or rust in the cooling system, it can get into the heater core and clog it. This leads to overheating of the motor due to poor air circulation.

FAQ: Frequently asked questions about the Nissan Almera G15 heater motor

Is it possible to repair the heater motor instead of replacing it?

Yes, but this is only advisable if there are problems with bearings or brushes. If the winding burns out or the shaft is damaged, repairs will cost more than buying a new motor. For disassembly you will need:

1. Remove the impeller (it is attached to a rivet or nut).
2. Disassemble the housing and clean the collector from carbon deposits.
3. Replace brushes (if they are worn) or bearings.

The cost of a repair kit (brushes + bearings) is about 800–1,200 rubles, but the work requires experience.

Why does the heater only blow at speed 4?

This is a typical sign of a problem speed resistor (article 27380-BM40A). At speed 4, the current flows directly, bypassing the resistor, so the fan works. Replacing a resistor takes 10–15 minutes and costs 1,000–1,500 rubles.

How to check the heater motor without removing it?

You can apply voltage directly through the diagnostic connector:

1. Remove the fuse box cover under the steering wheel.
2. Find the motor connector (3 contacts: +12V, ground, signal from the resistor).
3. Connect the battery positive to the terminal +12V, and minus - to the contact masses.
4. If the motor does not work, it is faulty.

Be careful: if connected incorrectly, you can burn the fuse or relay.

What is the difference between the heater motor on an Almera G15 with and without air conditioning?

Structurally, the motors are the same (article number 27350-BM40A), but in versions with air conditioning an additional evaporator temperature sensor, which may affect the operation of the fan. When replacing, this does not matter - the motor will work with any modification.

How much does it cost to replace a heater motor at a service center?

Cost of work in services in Moscow and regions:

• Diagnostics: 500–1,000 rubles.
• Replacing the motor: 1,500–2,500 rubles.
• Replacing the speed resistor: 500–800 rubles.

Total with spare part: 5,000–9,000 rubles (depending on the selected motor). Replacing it yourself can save you up to 50%.