Replacing the stove with Nissan Almera G15 - a task that sooner or later faces every owner of this popular sedan. The heater in this car is not particularly reliable, especially after 100-150 thousand kilometers. Problems manifest themselves in different ways: from a weak flow of warm air to complete system failure, when the cabin becomes colder in winter than outside. The reasons may lie in a clogged radiator, a faulty stove motor or a damaged control unit.

Many car owners immediately go to a service center, but in fact, you can replace the stove yourself - if you know the sequence of actions and have the necessary tools at hand. In this article we will look at all stages of the process: from diagnosing a malfunction to putting the system back together. We will pay special attention hidden fastenings under the panel, which are often overlooked during DIY repairs, as well as the nuances of choosing original and analog spare parts. If you are ready to save 8-15 thousand rubles on the work of a master, read on.

Signs of a malfunctioning stove on Almera G15

Before proceeding with replacement, it is important to make sure that the problem is in the heater and not in other elements of the cooling system or electrical system. Here are the key symptoms indicating a malfunctioning stove:

  • 🔥 Weak or cold air even at the maximum temperature on the control panel. Most often this indicates a clogged heater core or a malfunctioning thermostat.
  • 🌀 Noise or grinding noise when the fan is turned on. This is a sign of wear on the stove motor bearings or debris getting into the impeller.
  • 💧 Antifreeze leak under the passenger's feet. Indicates cracks in the heater core or damaged pipes.
  • 🔌 Temperature adjustment does not work. There may be problems with the dampers, drive or climate control unit.

If you observe at least one of these signs, the furnace most likely requires repair or replacement. But before disassembling the panel, check:

  1. The antifreeze level in the expansion tank (should be between MIN And MAX).
  2. Thermostat operation (when the engine is warm, the upper radiator hose should be hot).
  3. fuse F30 (10A) in the mounting block - it is responsible for powering the stove motor.
⚠️ Attention: If antifreeze disappears quickly (more than 1 liter per 1000 km), do not rush to change the stove. First, check the tightness of the cooling system - there may be a leak from under the cylinder head or a gasket breakdown.
📊 What stove problem have you encountered?
  • Weak airflow
  • Antifreeze leak
  • Fan noise
  • Temperature not regulated
  • Other

What spare parts are needed for replacement?

Depending on your diagnosis, you may need different parts. On Nissan Almera G15 (2013–2018) stoves with catalog numbers were installed:

Detail Original number Analogs (brand) Approximate price, ₽
Heater radiator 27200-BM40A Nissens (641019), Denso (DH1005) 3 500–5 000
Stove motor (assembled) 27300-BM400 Valeo (718328), Febi (27300) 4 000–6 500
Resistor block 27350-BM400 Hella (6EL 009 131-031) 1 200–2 000
Micromotor damper reducer 27250-BM400 SMP (TX100) 2 500–3 800

When choosing spare parts, pay attention to:

  • 📌 VIN compatibility. Check the part number with your dealer or through online catalogs such as Nissan EPC.
  • 🔄 Complete set. Some radiators are sold without pipes - they will have to be replaced from the old one.
  • 🛡️ Guarantee. Original parts provide a warranty of 1–2 years, analogues - from 6 months.

If your budget is limited, you can save on analogues, but remember: cheap radiators (for example, Chinese ones without a brand) often leak within a year. The best option is Denso or Nissens.

💡

Before purchasing a stove radiator, check it for leaks right in the store. Pour water into one pipe - if drops appear on the body, refuse to purchase.

Tools and preparation for work

To replace the stove with Almera G15 you will need:

Phillips (PH2) and flathead (3mm) screwdrivers|10 and 12mm sockets with extension|Pliers and wire cutters|Plastic cutting knife|Silicone sealant (e.g. ABRO 999>)|Set of socket wrenches|Flashlight with magnet|Container for draining antifreeze (5 l)-->

Also prepare:

  • 🧴 New antifreeze (2–3 l, for example, CoolStream A-110 or original KE902-99932).
  • 🧼 Rags and cleaning agent (For example, LIQUI MOLY Kuhler-Reiniger to flush the system).
  • 🔌 Multimeter for checking electrical circuits.

It is better to carry out the work in a garage with a pit or on an overpass. Complete disassembly of the panel will take 4–6 hours, so allow yourself some time. If you have little experience, take photographs of each stage of disassembly - this will help with reassembly.

⚠️ Attention: Before starting work, disconnect the negative terminal of the battery! Otherwise, you risk short-circuiting the wiring when dismantling the panel.

Step-by-step instructions for replacing the heater radiator

The heater radiator is the most common culprit of problems. Replacing it requires complete dismantling of the dashboard. Follow the algorithm:

  1. Drain the antifreeze. Unscrew the plug on the cooling radiator (bottom right) and the drain bolt on the cylinder block (10mm wrench). Place the container.
  2. Remove the instrument panel.
    • Unscrew the 2 bolts under the steering wheel (head 10).
    • Remove the radio cover (pry it up with a screwdriver from below).
    • Disconnect the connectors from the climate control and backlight buttons.
    • Unscrew the 4 bolts securing the panel to the body (2 on top, 2 on the sides).
  • Remove the radiator. It is located behind the center console, under the glove compartment. Disconnect the pipes (loosen the clamps) and unscrew the 3 mounting bolts (10mm head).
  • Install a new radiator. Before installation, apply a thin layer of sealant to the rubber seals of the pipes.

    • When assembling, pay attention to:

    • 🔌 Connecting connectors to the climate control unit (they should click).
    • 🔧 Tightening the clamps on the pipes - do not overtighten so as not to damage the rubber.
    • 📏 Aligning the panel — if the dashboard becomes crooked, there will be squeaks.
    How to check a radiator for leaks without removing it?

    Start the engine, warm up to operating temperature (90°C) and turn on the heater to maximum. If cold air comes from the deflectors, and the heater radiator pipes are hot, the problem is in the dampers. If the pipes are cold, the radiator is clogged or antifreeze is not circulating.

    Replacing the stove motor and resistor

    If the problem is with the fan (no airflow or only one speed), the culprit is often the heater motor or resistor block. Replacing them is easier than replacing a radiator - you do not need to completely remove the panel.

    Sequence of actions:

    1. Remove the glove compartment (unscrew 3 bolts from the bottom and 2 from the top).
    2. Disconnect the heater motor power connector (white plastic block).
    3. Unscrew the 3 motor mounting screws (Phillips screwdriver).
    4. Remove the motor along with the impeller. Check it for play - if there is any, replace the bearing or motor assembly.

    The resistor block is located nearby, under a plastic cover. Replacing it takes 10 minutes:

    1. Disconnect the connector.
    2. Unscrew the 2 mounting bolts (head 10).
    3. Install the new unit, connect the connector.

    After replacement, check the operation of the stove at all speeds. If 4th speed does not engage, the problem may be a panel switch or an open circuit.

    💡

    If, after replacing the motor, the stove only works at maximum speed, the resistor block is to blame. On Almera G15 it fails in 60% of cases due to problems with airflow.

    Assembly nuances and system testing

    After replacing parts, reassemble everything in reverse order, but keep a few points in mind:

    • 🔄 Flush the cooling system. Fill with special liquid (for example, LIQUI MOLY Kuhler-Reiniger) and run the engine for 10–15 minutes. Then drain and refill with new antifreeze.
    • 🔥 Bleed the system. After adding antifreeze, remove the throttle heating hose (on the intake manifold) and wait until bubble-free liquid comes out of it.
    • 📋 Check the error codes. If the panel lights up CHECK ENGINE, scan the ECU for errors in the temperature sensor (for example, P0115).

    First start of the stove after repair:

    1. Warm up the engine to operating temperature (arrow in the middle of the scale).
    2. Turn on the stove to maximum airflow and temperature.
    3. Check whether hot air is coming from all deflectors (including the windshield).
    4. Inspect the floor under the passenger's feet for leaks.
    ⚠️ Attention: If the heater blows cold air after replacing the radiator, check the thermostat. On the Almera G15 it often gets stuck in the open position, and the antifreeze circulates only in a small circle without heating up.

    Common mistakes when replacing a stove

    Even experienced craftsmen sometimes make mistakes that lead to repeated breakdowns. Here's what not to do:

    • 🚫 Use old pipes. Rubber becomes dull over time and may burst. Always change the hoses together with the radiator.
    • 🚫 Tighten the clamps by eye. Weak tightening leads to leaks, too strong - to cracks in the pipes. Use a torque wrench (torque 1.5–2 Nm).
    • 🚫 Ignore flushing the system. If you do not remove the old antifreeze with deposits, the new radiator will clog within 1-2 seasons.
    • 🚫 Connect connectors “blindly”. On the Almera G15, the connectors for the heater motor and the resistor block are similar - get it mixed up and the fan will not work correctly.

    Another common mistake is incorrect installation of the dampers. If after assembly the air only flows into the legs or onto the glass, check:

    • Correct connection of the damper control cable (it should be tensioned without sagging).
    • The performance of the micromotor gearbox (when different blowing modes are turned on, a click should be heard).

    FAQ: Answers to frequently asked questions

    Is it possible to replace the heater radiator without removing the panel?

    Theoretically yes, but in practice it is almost impossible. On Almera G15 The radiator is located too deep and cannot be reached without dismantling the dashboard. The only option is to cut the panel, but this will ruin its rigidity and appearance.

    How much antifreeze is needed for replacement?

    The full capacity of the cooling system is 6.7 liters, but when replacing the heater radiator, about 3–4 liters are drained. It is recommended to buy 5 liters of new antifreeze, so that there is enough for flushing and topping up.

    What antifreeze should I fill in Almera G15?

    Original antifreeze - Nissan Coolant L250 Premix (blue color). Suitable analogues: CoolStream A-110, Sintec Unlimited G12++, Motul Inugel Optimal. The main thing is that the liquid is based on ethylene glycol (G12 or G12+).

    Why does the heater blow cold air after replacing the radiator?

    There are several reasons:

    1. There is air left in the system (needs to be bled).
    2. The thermostat is faulty (replace with a new, original number - 21200-4M505).
    3. The honeycombs of the new radiator are clogged (flush the system before installation).
    4. The damper control cable is not connected (check under the panel).
    How much does it cost to replace a stove at a service center?

    The cost depends on the region and scope of work:

    • Replacing the stove radiator - 8,000–12,000 rubles.
    • Replacement of the stove motor - 3,000–5,000 rubles.
    • Complete inspection of the system (radiator + motor + resistor) - 15,000–20,000 ₽.

    Do-it-yourself repairs will cost 2–3 times less.