Heater motor <em>Nissan Almera G15</em> with air conditioning: signs of malfunction, repair and replacement

Nissan Almera G15 is a popular sedan, but owners often encounter heater problems, especially in models with air conditioning. The heater motor is the weak point here: it operates under increased load conditions due to the integrated climate control system. If in winter the interior does not warm up well, and in summer the air conditioner blows weakly, this particular unit may be to blame.

Unlike versions without air conditioning, where the heater motor is simpler in design, Almera G15 with a climate system, it is equipped with an additional resistor and a more powerful electric motor. This complicates diagnosis: symptoms of a malfunction can be disguised as a breakdown of the thermostat, heater radiator, or even the air conditioning compressor. In this article, we’ll look at how to accurately identify the problem, select spare parts and carry out repairs yourself - without extra costs for service.

Signs of a malfunctioning heater motor Nissan Almera G15 with air conditioning

The first signal is a change in the operation of the cooling system. B Almera G15 with air conditioning, the heater motor is controlled through a resistor, so breakdowns appear gradually. Pay attention to the following symptoms:

• 🔊 Extraneous sounds (creaking, squealing, knocking) when you turn on the stove or air conditioner - a sign of wear on the bearings or debris getting into the impeller.
• 🌀 Uneven fan operation: blowing speeds change spontaneously, even if the regulator is in one position.
• ❄️ Weak airflow at maximum speed - often the resistor or a broken motor winding is to blame.
• 🔥 The stove only blows hot or cold air, regardless of the settings, a jammed damper (damper) is possible.

Feature Almera G15 with air conditioning: the heater motor here is connected to the air recirculation system. If, when you turn on recirculation, the airflow disappears completely, the problem is definitely in the motor or its power circuit. Unlike models without climate control, even minor glitches cannot be ignored here: they progress quickly.

⚠️ Attention! If the stove motor starts to smoke or there is a burning smell, turn it off immediately! B Almera G15 The air conditioner uses a plastic fan housing, which can ignite if there is a short circuit.

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

Before replacing the motor, check its functionality. B Nissan Almera G15 With air conditioning, diagnostics are complicated by the presence of a resistor and a climate control unit. Start with simple steps:

1. Checking the fuse: it is located in the mounting block under the hood (fuse F30 (10A) is responsible for the heater motor circuit).
2. Resistor test: It is located next to the motor. If the resistor is faulty, the stove only works at 4th speed.
3. Direct connection: remove the connector from the motor and apply it to it 12V directly from the battery. If it does not spin, the engine itself is faulty.

For accurate diagnostics, use a multimeter:

• 🔋 Measure the voltage at the motor connector with the stove on. At 1st speed it should be ~4-6V, on the 4th - 12V.
• 🔄 Check the resistance of the motor windings: there should be 1.5-3 Ohm. Infinite resistance is a break.

Symptom	Probable Cause	Verification method
The stove does not work at speeds 1-3	Resistor faulty	Test the resistor with a multimeter
The motor hums but does not rotate	Impeller or bearing jammed	Disassemble and check shaft play
The stove only works at maximum speed	Open circuit in the resistor circuit	Checking the voltage at the connector
Burnt smell when working	Short circuit in the winding	Visual inspection for burning

If the motor does not respond to direct connection, but the fuse and resistor are working, the problem is in the motor itself or its brushes. B Almera G15 With an air conditioner, the manifold assembly often wears out due to high humidity (condensation from the air conditioner radiator gets onto the motor).

Selection of spare parts: original vs analogues

For Nissan Almera G15 with air conditioning, the original heater motor has an article number 27350-BM40A (or 27350-BM40B for restyled models). Price - from 8 to 12 thousand rubles. However, there are high-quality analogues:

• 🔧 Febi (20316) — German brand, complete analogue of the original, price ~6 thousand rubles.
• 🔧 Valeo (718401) — reliable option with reinforced bearings, ~7 thousand rubles.
• 🔧 Denso (721-0106) — Japanese quality, but requires modification of the connector, ~5.5 thousand rubles.
• 🔧 Tolyatti analogues (for example, "Pekar") - a budget option (~2 thousand rubles), but the resource is 2-3 times less.

Important: motors for Almera G15 with air conditioning use an extended shaft and a special impeller with 7 blades. Analogues without air conditioning (article 27350-BM400) are not suitable! When purchasing, check:

• 📏 The length of the shaft must be 85 mm (for versions without air conditioning - 70 mm).
• 🔌 Connector type: motors with air conditioning have 3 contacts (regular ones have 2).
• 🌀 The shape of the impeller should be asymmetrical for the correct direction of flow.

If your budget is limited, you can restore the old motor: brushes most often wear out (article number 27355-BM400, ~500 rub.) or bearings (6202-2RS, ~300 rub. per pair). For Almera G15 With air conditioning, repair kits with seals and lubricants are sold.

⚠️ Attention! When purchasing analogues, avoid motors with a plastic impeller - they cannot withstand the load from the air conditioner and break down after 1-2 seasons. Look for a metal or reinforced plastic impeller.

Step-by-step replacement of the stove motor in Nissan Almera G15 with air conditioning

Replacing the motor with Almera G15 with air conditioning is more difficult than on versions without it: you need to remove the air conditioning evaporator and partially disassemble the dashboard. Prepare your tools:

• 🔧 Set of heads and extension (for bolts under the dashboard).
• 🔧 Screwdriver with Phillips bit PH2.
• 🔧 Plastic spatulas for removing clips.
• 🔧 Flashlight - without it you won’t see the motor mount.

Work order:

1. Removing the glove compartment:
   • Unscrew the 3 bolts from the bottom and the 2 screws from the side.
   • Disconnect the backlight connector and remove the glove compartment.
2. Removing the panel under the steering wheel:
   • Remove the plastic trim under the steering column (2 clips).
   • Unscrew the dashboard mounting bolt on the right (head for 10).
3. Access to the motor:
   • Disconnect the motor connector (white, 3 pins).
   • Unscrew the 3 mounting bolts (head for 8) and remove the motor down.

When installing a new motor:

• 🔌 Connect the connector after fixing the motor with bolts - otherwise the contacts may be damaged.
• 🌀 Check the direction of rotation of the impeller: when you turn on the stove, it should blow to the salon (at yourself, if you look from the side of the motor).
• 🔧 Tighten the fastening bolts firmly 1.5 Nm — constriction leads to deformation of the body.

Reassemble in reverse order. After installation, check the operation of the stove at all speeds and turn on the air conditioner - if the airflow is uniform and there are no extraneous sounds, the replacement was successful.

Typical replacement mistakes and how to avoid them

Even experienced car owners make mistakes when working with the heater motor. Almera G15. Here are the most common:

• 🔧 Ignoring resistor: if replacing the motor did not help, the resistor may be to blame (article number 27380-BM400). It needs to be checked to replacing the motor.
• 🔌 Reversed polarity: When connected directly to the battery, the motor may burn out if “+” and “-” are mixed up. B Almera G15 The polarity is indicated on the motor body (red wire - “+”).
• 🌀 Incorrect impeller installation: if you put it upside down, the airflow will be weak. There is a mark (arrow) on the impeller that should look towards the salon.
• 🔧 Tightening bolts without a torque wrench: over-tightening leads to cracks in the body, weak tightening leads to vibrations.

Another typical problem is they forget to check stove damper (damper). B Almera G15 With air conditioning, it often jams due to dirt. If, after replacing the motor, air only blows into the legs or onto the windshield, clean the damper and lubricate its mechanism (LIQUI MOLY Silicone-Fett lubricant).

⚠️ Attention! When replacing the motor, do not use impact tools (for example, a pneumatic impact wrench) - the heater body is in Almera G15 It's plastic and may crack. Unscrew all bolts only by hand!

What should I do if, after replacing the motor, the stove still does not work?

If the motor is new, but the stove does not blow, check:

1. Fuse F30 (10A) and relay K9 in the mounting block.

2. Integrity of the wiring from the climate control unit to the motor (wires near the glove compartment often fray).

3. The functionality of the heater control unit (in Almera G15 with air conditioning it is located behind the center console).

4. The presence of voltage at the resistor connector (should be 12V at 4th speed).

If the problem is not found, the climate control unit itself (part number 27800-BM400) may be faulty.

Prevention: how to extend the life of a stove motor

B Nissan Almera G15 With air conditioning, the heater motor operates in extreme conditions: high humidity from the evaporator, temperature changes, dust. To avoid damage:

• 🌬️ Clean the cabin filter every 15 thousand km (or more often if you drive on dusty roads). A clogged filter increases the load on the motor.
• 💧 Dry the air conditioning system before winter: turn on the air conditioner for 10 minutes with the windows open - this will remove moisture from the evaporator.
• 🔧 Lubricate the motor bearings every 50 thousand km. Use lubricant for electric motors (for example, Molykote EM-30L).
• 🚗 Avoid operating the stove for long periods of time at maximum speed. - this reduces the life of the brushes.

Pay special attention stove resistor. B Almera G15 it often burns out due to oxidation of contacts. Once a year, remove the resistor connector and clean the contacts WD-40 and apply contact lubricant. This will extend the life of the entire unit.

If you notice that the stove began to work worse after washing the engine, water probably entered the engine through the ventilation holes. In this case:

1. Remove the motor and dry it with a hairdryer (at least 30 minutes).
2. Check the resistance of the windings - if it has changed, the motor needs to be replaced.
3. Reinstall after pre-treating the connector silicone grease.

Comparison of stove motors for Almera G15 with and without air conditioning

Many owners Nissan Almera G15 they don’t know that the heater motors for versions with and without air conditioning are not interchangeable. Here are the key differences:

Parameter	With air conditioning	Without air conditioning
Original article number	27350-BM40A	27350-BM400
Number of contacts	3 (with resistor)	2
Shaft length, mm	85	70
Impeller type	7 blades, reinforced plastic	5 blades, plastic
Power, W	120	90

Motors with air conditioning also have a different impeller blade angle - this is necessary for proper distribution of air flow through the evaporator. If you install a motor from a version without air conditioning, the airflow will be weak, and the air conditioner will not be able to effectively cool the interior.

Another difference - presence of Hall sensor in engines with air conditioning. It is responsible for feedback to the climate control unit. In versions without air conditioning, this sensor is missing, so the climate control unit will not be able to correctly regulate the fan speed.

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

Is it possible to repair the heater motor or just replace it?

In most cases, the motor can be repaired. Most often they fail:

• 🔧 Brushes (article number 27355-BM400, ~500 rub.).
• 🔧 Bearings (6202-2RS, ~300 rub. per pair).
• 🔧 Collector (can be sharpened on a lathe).

If the winding burns out or the housing cracks, just replace it. Repair is justified if the cost of spare parts does not exceed 30% of the price of a new motor.

Why does the heater only blow at speed 4?

This is a typical sign of a problem heater resistor (article number 27380-BM400). At speed 4, the current flows directly, bypassing the resistor, so the motor works. At speeds 1-3, current passes through the resistor, and if it burns out, there is no airflow.

Solution: replace the resistor (cost ~1.5 thousand rubles). It is located next to the motor and is secured with two bolts.

How to check the heater motor without removing it?

Methods of checking without dismantling:

1. Turn on the ignition and heater to 1st speed. Move the motor connector with your hand (located under the glove compartment). If the stove starts working, the problem is in oxidized contacts.
2. Check the voltage at the motor connector with a multimeter (should be ~6V at 1st speed and 12V at 4th).
3. Listen to the motor: if it hums but does not rotate, the bearing or impeller is jammed.

How long does it take to replace a motor?

Replacement time depends on experience:

• 🔧 Newbie: 3-4 hours (including removal of the dashboard).
• 🔧 Experienced car owner: 1.5-2 hours.
• 🔧 Service: 1 hour (but the cost of work is from 3 thousand rubles).

Advice: if you have never disassembled the dashboard, take a photo of each stage of disassembly - this will help you put everything back together without unnecessary parts.

Is it possible to drive without a heater motor?

Technically possible, but:

• ❄️ In winter, the salon will not warm up, which is dangerous to health and can lead to fogging of the glass.
• 🔥 In summer, the air conditioner will not work effectively - cold air will not enter the salon.
• 🚗 B Almera G15 With air conditioning, the lack of airflow leads to freezing of the evaporator and breakdown of the compressor.

If the motor burns out and there is no replacement at hand, temporarily connect the fan directly to the battery via a button, but do not leave it unattended!