Replacing the heater radiator with Nissan Almera G15 - one of the most time-consuming, but necessary procedures when the heating system fails. Owners of this model often encounter problems with cold air from the deflectors, antifreeze leaks on the passenger mat, or constant fogging of the windows. In 80% of cases, the heater radiator is to blame, as over time it becomes clogged, corrodes or leaks.

Car service centers charge from 8 to 15 thousand rubles for this work, but if you have the tools and patience, you can do it yourself. The main difficulty is dismantling the dashboard, which requires care and knowledge of the nuances of fastenings. In this article we will analyze the entire process from fault diagnosis to assembly, we will indicate critical moments, where mistakes are most often made, and we will give recommendations on the selection of spare parts.

Signs of a malfunction of the Almera G15 heater radiator

Before you start replacing, make sure that the problem is in the heater core. The symptoms may coincide with a malfunction of the thermostat, pump, or air lock in the cooling system. Here are the key signs indicating a stove radiator:

  • 🔥 Cold air from deflectors with the engine running and the heater tap open. Even at high fan speeds there is no heat.
  • 💧 Antifreeze puddles under the glove compartment or on the passenger mat. The liquid usually has a sweetish odor and bright color (green, red, blue).
  • 🌫️ Constant fogging of windows, especially in rain or high humidity. This is due to the evaporation of antifreeze inside the cabin.
  • 🔄 Frequent drop in coolant level no visible external leaks under the hood.

If any of these symptoms occur, first check antifreeze level in the expansion tank and inspect the interior for fluid. For an accurate diagnosis, you can temporarily disconnect the hoses from the heater radiator and blow it out - if air does not pass through, it means it is clogged.

⚠️ Attention: Do not confuse a heater radiator leak with condensation from an air conditioner! Condensation forms under the car on the front passenger side and is colorless/odorless. Antifreeze always leaves colored marks.

Choosing a stove radiator: original vs analogues

The quality of the spare part determines how long the new stove will last. Original radiator from Nissan (article 27210-4M000) is expensive (from 6 to 9 thousand rubles), but guarantees a long service life. However, there are proven analogues that are not inferior in reliability:

Brand Article Price, rub. Features
Nissan (original) 27210-4M000 6 000–9 000 Best quality, copper tubes, long service life
Denso DRH0107 4 500–5 500 Japanese quality, often installed on the assembly line
Nissens 941023 3 800–4 500 Danish brand, good heat dissipation, aluminum body
Mahle HC 115 01 4 000–5 000 German quality, suitable for extreme temperatures
LUZAR (LRh 0107) LRh 0107 2 500–3 200 A budget option, but more often it leaks after 2-3 years

When choosing, pay attention to radiator material:

  • 🔹 Copper - dissipate heat better, but are heavier and more expensive. Original and Denso come with copper tubes.
  • 🔹 Aluminum - lighter and cheaper, but less resistant to corrosion. Nissens And Mahle Aluminum with a protective coating is used.

⚠️ Attention: Before purchasing, check the article number with the VIN code of your car! On Almera G15 Before 2016 and after, the radiator mountings may differ.
📊 Which stove radiator do you prefer?
  • Original Nissan
  • Denso
  • Nissens
  • Mahle
  • Budget analogue (LUZAR, etc.)

Preparing for replacement: tools and consumables

To replace the heater radiator with Almera G15 you will need:

  • 🔧 Tools:
    • Set of sockets and keys (8–14 mm)
    • 10 mm socket wrench (long)
    • Screwdrivers (Phillips, flathead, Torx T20)
    • Pliers and wire cutters
    • Knife and utility knife
    • Construction hair dryer (for softening plastic clips)
  • 🛢️ Consumables:
    • New heater radiator (see table above)
    • Antifreeze (5–6 liters, Nissan L255N or equivalent)
    • Distilled water (10 liters for rinsing)
    • Silicone grease (for hoses)
    • Clamps (4–6 pieces, diameter 16–22 mm)
    • Sealing rubber (if necessary)

Also prepare your workplace:

  • 🚗 Place the car on a flat area (preferably in a garage).
  • 🔌 Disconnect the battery terminal (minus first!).
  • 📦 Cover the interior with cardboard or film so as not to stain the seats.
  • 🕒 Reserve time - disassembly/assembly takes 6-10 hours.
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Before starting work, take a photo of all the connectors and fastenings of the dashboard with your phone - this will greatly simplify reassembly.

Step-by-step instructions: removing the dashboard and radiator

This is the most difficult stage. The main rule is do not break plastic clips! They are fragile and new ones are difficult to buy. Follow the instructions strictly step by step:

  1. Antifreeze drain.

    Unscrew the expansion tank cap and drain plug on the radiator (bottom right). Place a container with a volume of at least 6 liters. To speed up the process, you can disconnect the lower heater hose under the hood.

  2. Removing the glove compartment.

    Unscrew the 4 screws inside the glove compartment (2 from below, 2 from above) and 2 bolts under the dashboard. Carefully pull out the glove compartment by disconnecting the backlight connector.

  3. Removing the center console.

    Remove the plastic covers around the gearshift lever, unscrew the 2 bolts under the cup holders. Disconnect the connectors for the heated seats (if equipped) and the automatic transmission selector (on automatic transmissions).

  4. Disconnecting the dashboard.

    Here is the most difficult thing - you need to unscrew:

    • 2 bolts under the steering wheel (remove the lower trim)
    • 2 bolts on the sides of the dashboard (behind the plastic plugs)
    • 4 bolts on top (under the windshield trim)

Then carefully pull the dashboard towards you, disconnecting all the connectors (there are about 10–12 of them!).

  • Access to the radiator.

    After removing the dashboard you will see the stove body. Unscrew the 3 screws on the cover (on the right) and remove it. The radiator is secured with 2 bolts and 2 latches.

    • Disconnected battery terminal|Drained antifreeze|Removed glove compartment|Disconnected heater hoses|Photographed connectors-->

    Now you can remove the old radiator. Be careful - there may be antifreeze left in it! Before installing a new radiator flush the system distilled water to remove old fluid and dirt.

    How to flush the cooling system correctly?

    1. Pour distilled water into the expansion tank.

    2. Start the engine and let it idle for 10–15 minutes.

    3. Drain the water and repeat the procedure 2-3 times until the liquid is clear.

    4. Only after this add new antifreeze!

    Installation of a new radiator and assembly

    Installation of a new radiator is carried out in the reverse order, but there are several critical nuancesthat are often missed:

    • 🔧 Tightening the clamps. Use new clamps and tighten them without fanaticism - a pinched hose will quickly burst.
    • 🔄 Checking the stove tap. If the faucet is sour or leaking (part number 27250-4M000), replace it immediately!
    • 🛠️ Sealing. Apply a thin layer of sealant to the rubber radiator seals, but do not overdo it - too much can clog the system.
    • 🔥 System check. After assembly, start the engine and warm it up to operating temperature. Check:
      • Leaking under the dashboard
      • Heater fan operation at all speeds
      • Air temperature from deflectors

    When assembling the dashboard, pay attention to:

    • 🔌 Correct connection of all connectors (especially instrument lighting And climate control unit).
    • 🔩 Tightening the bolts - loose fasteners will lead to squeaks.
    • 🎛️ The location of the damper control cable - if it jumps off, the stove will not switch to warm air.
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    After replacing the radiator, be sure to remove the air plug! To do this, turn off the engine, unscrew the expansion tank cap and compress the upper heater hose 3-4 times.

    Common mistakes and how to avoid them

    Even experienced craftsmen sometimes make mistakes when replacing a stove radiator with Almera G15. Here are the most common:

    Error Consequences How to avoid
    All antifreeze is not drained Interior flooding when hoses are disconnected Blow out the system with air after draining
    Damaged hoses Leak after assembly Check hoses for cracks and replace if in doubt
    Incorrect throttle cable installation The stove only blows cold or hot air Check valve stroke manually before final assembly
    Overtightened clamps Cracks in hoses or radiator Use a torque wrench (torque 1.5–2 Nm)
    Air lock not removed Poor interior heating, engine overheating Warm up the car with the reservoir cap open and bleed the hoses

    Another typical problem is squeaks after assembly. They arise due to:

    • 🔧 Insufficient tightening of the dashboard bolts.
    • 🔄 Debris getting between plastic panels.
    • 🔥 Deformation of clips during disassembly.

    If creaks appear, disassemble the problem area and check all fasteners. Treating plastic surfaces often helps. silicone grease.

    Cost of work in the service vs independent replacement

    Prices for replacing a heater radiator at car repair shops vary greatly depending on the region and level of the service station. On average:

    • 💰 Moscow and St. Petersburg: 12,000–18,000 rubles (with spare parts - up to 25,000).
    • 💰 Regions: 8,000–12,000 rubles (with spare parts – 15,000–20,000).
    • 💰 Garage workshops: 5,000–8,000 rubles (risk of poor quality assembly!).

    If you replace it yourself, your costs will be limited to:

    • 🛒 Radiator - 2,500–9,000 rubles.
    • 🛒 Antifreeze - 1,500–2,500 rubles (5 liters).
    • 🛒 Clamps and consumables - 300–500 rubles.

    Total: from 4,300 to 12,000 rubles versus 15,000–25,000 in service. The savings are obvious, but remember that replacing it yourself requires time and care.

    ⚠️ Attention: If you have never disassembled the dashboard, practice disassembling other plastic elements of the interior (for example, door cards). This will help you understand the principle of fastenings and avoid breakdowns.

    FAQ: Frequently asked questions about replacing the radiator of the Almera G15 stove

    Is it possible to drive with a current heater radiator?

    Short-term - yes, but it is fraught with consequences:

    • 🔥 Engine overheating due to loss of antifreeze.
    • 💨 Antifreeze vapor poisoning (especially dangerous for children!).
    • 🔧 Corrosion of electronics under the dashboard.

    If the leak is severe, it is better to immediately replace the radiator or at least temporarily disconnect the heater hoses (loop them together).

    What antifreeze should I fill in after replacing?

    For Almera G15 recommended Nissan Coolant L255N (green) or its analogues:

    • CoolStream A-110 (red, G12+)
    • Sintec Unlimited (violet, G12++)
    • Felix Carbox G12+ (red)
    Do not mix different types of antifreeze! If you don’t know what was filled in previously, flush the system and fill in new antifreeze completely.

    How long does it take to replace?

    Depending on experience:

    • 🔧 Newbie: 8–12 hours (with breaks).
    • 🔧 Experienced car owner: 5–7 hours.
    • 🔧 Professional: 3–4 hours.

    Most of the time is spent on disassembling and assembling the dashboard. Replacing the radiator itself takes no more than 30–40 minutes.

    What to do if after replacement the stove does not heat?

    The reasons may be the following:

    • 🔥 Air lock — bleed the system (see instructions above).
    • 🔄 Incorrectly connected hoses — check the direction of flow (upper hose is outlet, lower hose is inlet).
    • 🔧 Stuck stove valve - replace the tap (27250-4M000).
    • 🛠️ Faulty thermostat - Check the temperature of the radiator pipes.

    Is it possible to flush the old radiator instead of replacing it?

    Theoretically yes, but the efficiency will be low. For washing:

    1. Remove the radiator and flush it citric acid solution (100 g per 1 liter of water).
    2. Pour in the solution and leave for 1-2 hours, then rinse with water.
    3. Blow out the radiator with compressed air.

    However, if the radiator is leaking or severely corroded, flushing will not help - only replacement.