Nissan Sunny is a legendary Japanese sedan that still remains popular in the secondary market due to its reliability and ease of maintenance. However, even the toughest machines have weaknesses, and cooling system radiator - one of them. Over time, it clogs, leaks or corrodes, leading to engine overheating and serious damage. In this article we will look at how to choose the right radiator for Sunny (including models B13, B14, B15), when to change it, and how to do it yourself without errors.
Feature Nissan Sunny — compact design of the engine compartment, so even minor flaws when replacing the radiator can result in problems: from antifreeze leakage to damage to the fan. We have collected current data on articles, prices for 2026, as well as unique nuances for GA14DE, GA16DE and SR20DE engines, which are often missed in standard instructions.
Signs of a radiator malfunction: when is it time to replace it?
The first symptoms of problems with the radiator on Nissan Sunny easily confused with a thermostat or pump malfunction. However there is 5 Key Signs, which directly point to the radiator:
- 🔥 Engine overheating — the temperature arrow on the dashboard rises above normal (90°C) even in cool weather.
- 💧 Antifreeze leaks under the car (orange or green spots) or on the radiator itself (especially in places where plastic and aluminum are soldered).
- 🌀 The smell of antifreeze in the cabin - a sign of microcracks or damage to the heater radiator (on Sunny B14/B15 this is a common problem).
- 🛑 Frequent fan operation even at idle speed - indicates poor heat transfer.
- 🧊 Cold air from the stove When the engine is warm, there may be an air lock or a clogged radiator.
If you notice at least two of these symptoms, check the radiator visually. On Nissan Sunny with mileage over 150 thousand km is often found honeycomb corrosion (especially if water was used instead of antifreeze) or destruction of plastic tanks from vibrations. In 80% of cases, repairing a radiator (soldering, sealants) gives a temporary effect - it is better to immediately plan a replacement.
⚠️ Attention: On Sunny B13 with engine GA14DE The radiator has a unique fan mounting shape. If you buy an analogue without taking this nuance into account, the new radiator may not fit into the standard places!
Original vs analogues: what to choose for Nissan Sunny?
Original radiator from Nissan (article 21460-4M000 for B14/B15) will cost 8–12 thousand rubles, but its quality justifies the price: aluminum honeycombs with anti-corrosion coating and durable plastic tanks. However, there are worthy analogues on the market that are 2-3 times cheaper. The table below shows proven options for different generations. Sunny:
| Model Sunny | Original article number | The best analogues (brand + article) | Price, rub. (2026) |
|---|---|---|---|
| B13 (1990–1994) | 21460-4M000 |
Denso DRC0104, Nissens 64101 |
3 500–5 000 |
| B14 (1994–1998, GA14DE/GA16DE) | 21460-4M005 |
Koyorad NH051058, Behr 20 200 970 321 |
4 200–6 500 |
| B15 (1998–2006, GA16DE/SR20DE) | 21460-4M010 |
Spectra Premium CU1058, Metelli 13-01-0058 |
4 800–7 200 |
When choosing an analogue, pay attention to:
- 🔧 Material of tanks — the plastic must be reinforced (on cheap radiators it cracks after 1–2 years).
- 🔄 Honeycomb thickness — for the original it is 16–18 mm, for analogues it is often thinner (12–14 mm), which reduces the cooling efficiency.
- 🔌 Fan Mounts - on B14/B15 they must match the original (otherwise they will have to be modified).
- Original Nissan (expensive but reliable)
- Kojorad/Denso (optimal price-quality ratio)
- Budget analogue (Spectra, Metelli)
- I don’t know, I’ll choose after reading the article
If you are exploiting Sunny in hot climates or with a motor SR20DE (turbo versions), it’s better not to save money and take Koyorad or Denso. These brands use copper-brass radiators with better heat transfer, which is critical for forced engines.
Step-by-step replacement of the radiator on a Nissan Sunny: instructions with photos
Replacing the radiator with Sunny takes 2–3 hours and does not require special tools. The main thing is to follow the sequence and not damage adjacent components (for example, an air conditioner condenser on B15). Below is a step-by-step algorithm for models B14/B15 (for B13 details are indicated separately).
Drain the antifreeze (open the valve on the cylinder block and radiator)|
Disconnect the battery terminal (to avoid short circuit)|
Remove the air filter and throttle body|
Disconnect the cooling fan connector|
Place a rag under the radiator (to collect the remaining antifreeze) -->
Step 1. Removing the old radiator
- Unscrew the two fan mounting bolts (key on
10 mm). - Disconnect the upper and lower radiator hoses (loosen the clamps with a screwdriver).
- On B15 with air conditioning, carefully move the condenser tubes to the side (do not bend them!).
- Lift the radiator up, tilting it at an angle of 45° (so as not to touch the fan blades).
Step 2. Installing a new radiator
Before installation, check:
- 🔍 Integrity of rubber seals on a new radiator (they are often forgotten to remove them from the shipping packaging).
- 🔧 Condition of the pipes - if they have hardened, replace them (part number for Sunny B14:
21494-4M000upper,21495-4M000lower).
Install the radiator in reverse order. Important point: on B13 the fan is attached first, and then the radiator, whereas on B14/B15 - on the contrary. After installation, fill with antifreeze (recommended for Sunny: Nissan L255N or CoolStream A-110).
How to properly fill antifreeze without air locks?
1. Fill antifreeze to the maximum mark in the expansion tank.
2. Start the engine and warm it up to operating temperature (the fan will turn on).
3. Turn off the engine, let cool for 10 minutes and add antifreeze to the level.
4. Repeat the procedure 2-3 times to expel air from the system.
5. Check for leaks after 2–3 days of use.
⚠️ Attention: On Nissan Sunny B15 with engine SR20DE After replacing the radiator, be sure to check the operation temperature sensor (located in the lower tank). If it is faulty, the ECU will receive incorrect data, which will lead to detonation!
Common mistakes when replacing a radiator and how to avoid them
Even experienced car owners make mistakes that later result in repeated repairs. Here TOP-5 misses when replacing the radiator with Sunny:
- 🚫 Using sealant to eliminate leaks - it clogs the honeycomb and impairs heat transfer. It is better to solder or change the radiator.
- 🔩 Re-tightening of pipe clamps - on plastic tanks this leads to cracks. Tighten with a force of 1.5–2 Nm.
- 💦 Mixing antifreeze different types (for example, G11 And G12) - this causes corrosion. Use only Nissan-compatible liquids.
- 🌀 Ignoring system flushing - if there was rust in the old fluid, it will clog the new radiator. Flush the system
LAVR Radiator Flush Classic. - ⚡ Incorrect fan connection - on B14 it should rotate clockwise (as viewed from the radiator).
Another common mistake is failure to check thermostat after replacing the radiator. If the thermostat is stuck closed, the antifreeze will not circulate properly and the engine will overheat. On Sunny The thermostat is located in the housing on the cylinder block (original article number: 21200-4M000).
Before installing a new radiator, apply a thin layer sealant-sealant (For example, ABRO 11-AB) on the rubber gaskets of the pipes. This will prevent air leaks and leaks.
How to extend the life of a radiator: prevention and care
Radiator service life Nissan Sunny depends not only on the quality of the part, but also on the operating conditions. Here 5 rulesthat will help avoid premature replacement:
- 🔄 Change antifreeze every 60 thousand km or once every 3 years. Use only carboxylate liquids (for example, CoolStream Premium).
- 🚿 Flush the radiator outside every 20 thousand km (with a stream of water under low pressure so as not to bend the honeycombs).
- 🌡️ Monitor the temperature: If the needle frequently rises above 90°C, check the radiator for blockages.
- 🛠️ Use distilled water to dilute antifreeze concentrate (ordinary water forms scale).
- 🔧 Check the system pressure (norm for Sunny: 0.9–1.1 kg/cm²). If it is lower, look for leaks.
On Sunny B13/B14 with mileage over 200 thousand km recommended install an additional oil cooler (item: 21910-4M000). This will reduce the load on the main radiator and increase engine life, especially in hot weather.
Regular radiator flushing Nissan Sunny special compounds (for example, LIQUI MOLY Kuhler-Reiniger) removes up to 90% of deposits and restores heat transfer.
Cost of work and where is the best place to change the radiator
Radiator replacement cost Nissan Sunny in services varies from 1,500 to 4,000 rubles depending on the region and complexity of the work. The table below shows average prices for 2026:
| Type of work | Cost, rub. | Lead time |
|---|---|---|
| Radiator replacement (without air conditioning) | 1 800–2 500 | 2–3 hours |
| Radiator replacement (with air conditioning) | 2 500–4 000 | 3–4 hours |
| Flushing the cooling system | 800–1 200 | 1 hour |
| Overheating diagnostics | 500–1 000 | 30–60 minutes |
If you decide to change the radiator yourself, please note: hidden costs:
- 💰 Antifreeze — 1,000–1,500 rub. for 5 liters.
- 🔧 Pipes — 300–800 rub. per set.
- 🧴 Sealant and flushing — 300–500 rub.
In Moscow and St. Petersburg, replacing the radiator with Sunny can be done in specialized services for Japanese cars, for example:
- Nissan Service Center (official dealers, but expensive).
- JapAuto (Japanese car repair network).
- Any proven service with experience working with Nissan 90s.
⚠️ Attention: Unofficial services often offer “universal” radiators at a low price. They are not suitable for Sunny, as they have different sizes of fastenings and thickness of honeycombs!
FAQ: Answers to frequently asked questions about Nissan Sunny radiators
Is it possible to drive with a current radiator if it leaks a little?
No, even a small leak leads to loss of antifreeze and the risk of overheating. On Sunny with engine GA16DE Overheating above 110°C can deform the cylinder head. It is better to immediately fix the leak or replace the radiator.
What antifreeze is best to fill in Nissan Sunny?
For all generations Sunny fits Nissan Long Life Coolant (green color, article number KE902-99932) or its analogues: CoolStream A-110, Sintec Unlimited G12+. The main thing is not to mix with other types!
How long does a radiator on a Sunny last on average?
The original radiator lasts 10–15 years or 200–250 thousand km. Analogues - 5–8 years. The period depends on the quality of the antifreeze and operating conditions. In hot climates or when using water instead of antifreeze, the radiator fails 2-3 times faster.
Is it possible to repair a radiator by soldering?
Yes, but only if there is a crack in the plastic tank. It is useless to solder honeycombs made of aluminum - they quickly oxidize. Can be used for temporary repairs epoxy glue (For example, DoneDeal DD6700), but this is a solution for 1–2 months.
Why does the heater blow cold air after replacing the radiator?
There are two reasons: air lock in the system (needs bleeding) or faulty heater valve (on B14/B15 it often turns sour). Also check the antifreeze level and thermostat operation.