Nissan Note E11 is a popular compact van, known for its reliability, but even it has problems with the cooling system over time. One of the most vulnerable elements is thermostat, which regulates the engine temperature. If it fails, the engine either overheats or takes too long to warm up, which leads to increased fuel consumption and wear of parts.

In this article we will look at how determine thermostat malfunction on Nissan Note E11 (with engines HR15DE And HR16DE), what symptoms should alert you, and how to replace it yourself without contacting service. We will also provide current prices for original and similar spare parts, compare them with fakes and give advice on selection.

Signs of a faulty thermostat Nissan Note E11

Thermostat in Note E11 it begins to “be capricious” gradually, and many drivers attribute the first symptoms to the weather or low-quality fuel. However, ignoring them is dangerous: engine overheating can lead to cylinder head deformation or failure of the cylinder head gasket.

Main signs of failure:

  • 🔥 Engine takes a long time to warm up (more than 10 minutes at temperatures above 0°C) or does not reach operating temperature at all (the sensor needle freezes at the cold mark).
  • 🌡️ Temperature arrow rises sharply after starting and falls when driving - a classic symptom of a “stuck” thermostat valve in the closed position.
  • 💨 The stove is blowing cold air even after the engine warms up (antifreeze does not circulate in a large circle).
  • ⚠️ The dashboard lights up CHECK ENGINE with an error P0128 (“Thermostat: low coolant temperature”).

If you notice any of these symptoms, do not delay diagnosis. On Nissan Note E11 with engine HR16DE overheating is especially dangerous due to the aluminum cylinder block, which is sensitive to temperature changes.

⚠️ Attention: If the temperature needle goes into the red zone, do not turn off the engine immediately - let it idle for 1-2 minutes, then turn the heater on to maximum. This will help lower the temperature a little before stopping.
📊 How often do you check your car's cooling system?
  • Once a month
  • Only before winter/summer
  • When symptoms appear
  • Never checked

Where is the thermostat located in Nissan Note E11?

B Nissan Note E11 The thermostat is located in top of the engine, next to the pump and gearbox. The exact location depends on the engine type:

  • 🔧 On HR15DE (1.5 l) - under the air duct, to the right of the battery. To get there you will have to remove the air filter.
  • 🔧 On HR16DE (1.6 l) - similar, but access is a little more difficult due to the denser layout of the engine compartment.

The thermostat is covered on top with a plastic or aluminum case (depending on the year of manufacture), which is secured with 2-3 bolts. Two pipes fit to it: upper (from the radiator) and lower (to the pump).

For clarity, look at the diagram:

Engine Thermostat location Difficulty of access (1–5)
HR15DE (1.5 l) Under the air duct, to the right of the battery 3
HR16DE (1.6 l) Similar, but closer to the box 4
Diesel versions (if available) To the left of the engine, under the turbine 5

On Nissan Note E11 after 2012, the thermostat can be integrated into the pump body - in this case, replacement will be more expensive, since the entire assembly will need to be dismantled.

How to check the thermostat for Nissan Note E11 without removal?

Before disassembling half of the engine compartment, you can express diagnostics without dismantling. All you need is your hands and patience.

Method 1: Warm-up Check

  1. Start the cold engine and watch the temperature gauge.
  2. After 2-3 minutes, gently touch upper radiator hose (it goes from the thermostat to the radiator).
  3. If the pipe cold — The thermostat is closed (normal for a cold engine).
  4. After warming up to 80–90°C, the pipe should become hot. If it stays cold - thermostat valve doesn't open.

Method 2: Check for overheating

If the engine heats up quickly, but the temperature drops when driving, the thermostat stuck open, and antifreeze circulates only in a large circle. In this case:

  • 🔍 Check it out lower pipe (from thermostat to pump) - it should always be hot.
  • 🔍 If both pipes are hot when warming up, the thermostat is “stuck” in the open state.
💡

On Nissan Note E11 With air conditioning, the thermostat may operate at a lower temperature (around 75°C) as the climate control system affects cooling. Take this into account when diagnosing.

Step-by-step instructions for replacing the thermostat with Nissan Note E11

If the diagnostics confirm the malfunction, we proceed to replacement. To work you will need:

  • 🔧 New thermostat (original 21200-4M50A or an analogue, for example, Gates or Mahle).
  • 🔧 Set of keys (for 10, 12 and 14).
  • 🔧 Screwdriver with flat and cross blade.
  • 🔧 Sealant for pipes (for example, Loctite 577).
  • 🔧 Antifreeze (1–1.5 l for topping up).
  • 🔧 Container for draining coolant.

Step 1: Preparation

Place the car on a flat surface, turn off the engine and let it cool (working with hot antifreeze is dangerous!). Open the hood and remove the negative terminal from the battery.

Step 2: Drain the antifreeze

Place a container under the radiator drain hole (bottom right) and unscrew the plug. On Note E11 You can also drain the liquid through expansion tank, but it will take longer.

Drain antifreeze (at least 1 l)|Disconnect the battery terminal|Remove the air filter|Prepare a new thermostat and sealant-->

Step 3: Removing the Old Thermostat

  1. Remove the air filter (unscrew the 2 bolts and loosen the pipe clamp).
  2. Loosen the clamps on the thermostat pipes and remove them.
  3. Unscrew 2-3 bolts securing the thermostat housing (usually a 10 or 12 wrench).
  4. Remove the old thermostat and clean the seat from any remaining sealant.

Step 4: Installing a New Thermostat

Before installation, check the functionality of the new thermostat: put it in boiling water - the valve should open. If this does not happen, the part is defective.

Apply a thin layer of sealant to the thermostat rubber ring, install it into the housing and tighten the bolts. Connect the pipes, fill in antifreeze and remove air from the system (to do this, squeeze the upper radiator pipe several times).

⚠️ Attention: On Nissan Note E11 after replacing the thermostat be sure to check the system for leaks. Start the engine, warm it up to operating temperature and inspect the pipes for leaks. If antifreeze drips from under the thermostat housing, tighten the bolts or add sealant.

How much does a thermostat cost? Nissan Note E11 and which one to choose?

Thermostat price for Nissan Note E11 depends on the brand and type (mechanical or electronic). The table below shows current prices for 2026:

Manufacturer Article Type Price, ₽ Notes
Original (Nissan) 21200-4M50A Mechanical 2 800–3 500 Best quality, but often counterfeited
Gates TH23575G1 Mechanical 1 800–2 200 Good analogue, resource 100+ thousand km
Mahle TH 31 88 Mechanical 2 000–2 500 High quality, suitable for HR16DE
Vernet TH6317.85 Mechanical 1 500–1 900 Budget option, but fails more often
Febi 21200 Mechanical 1 700–2 000 Average quality, suitable for temporary replacement

When choosing, pay attention to:

  • 🔍 Opening temperature - for Note E11 optimal 82–88°C.
  • 🔍 Housing material - aluminum is stronger than plastic, but more expensive.
  • 🔍 Availability of O-ring — A new ring should come with the thermostat.
How to distinguish an original from a fake?

Original thermostat Nissan has:

1. Clear labeling 21200-4M50A on the body (without blurry symbols).

2. Logo Nissan engraved, not pasted on.

3. Packaging - thick cardboard with a hologram.

4. The set includes a rubber ring with an oil-resistant coating (in fakes it often hardens after a year).

Common mistakes when replacing a thermostat and how to avoid them

Even experienced car owners sometimes make mistakes that lead to repeated breakdowns or antifreeze leaks. Here are the most common:

  1. Using old sealant. If you do not clean the seat from residual sealant, the new layer will lie unevenly and a leak will appear. Solution: use a scraper or solvent to remove old sealant.
  2. Re-tightening of body bolts. This leads to deformation of the aluminum housing or cracks. Solution: tighten the bolts crosswise with a force of 8–10 Nm.
  3. Wrong thermostat selection. Installing a part with a different opening temperature (for example, 75°C instead of 82°C) leads to overheating or underheating. Solution: check the article by VIN code.
  4. Airing the system. If you do not bleed the air after replacement, the stove will blow cold and the engine will overheat. Solution: After filling with antifreeze, compress the radiator pipes 3-4 times.

On Nissan Note E11 with automatic transmission (CVT) engine overheating is especially dangerous, since the oil in the variator heats up along with the antifreeze. When replacing the thermostat, be sure to check the condition of the automatic transmission cooling radiator.

1. Antifreeze level (must be between MIN and MAX).

2. Operation of the cooling fan (should turn on at 95–100°C).

3. Condition of the radiator (clogged honeycombs reduce cooling efficiency).-->

FAQ: Frequently asked questions about the thermostat Nissan Note E11

Is it possible to drive with a faulty thermostat?

Short term - yes, but with caution. If the thermostat is stuck in open position, the engine will take longer to warm up, which will increase fuel consumption. If stuck in closed — risk of overheating and damage to the cylinder head. In both cases, it is recommended to replace the part as soon as possible.

What antifreeze should I fill in after replacing the thermostat?

For Nissan Note E11 suitable antifreeze Nissan Coolant L248 Premix (blue) or its analogues: Coolstream Premium, Sintec Unlimited. The volume of the cooling system is ~5.5 l, but when replacing the thermostat it is enough to add 1–1.5 l.

How long does it take to replace a thermostat?

If you have the tools and experience - 1.5–2 hours. For beginners, it may take up to 3-4 hours, especially if you have to drain the antifreeze through the radiator.

Is it possible to flush the thermostat instead of replacing it?

No. If the thermostat valve is stuck or worn, flushing will not help. The only temporary solution is to knock on the thermostat housing while the engine is running (sometimes this helps to “stir” the valve), but this does not solve the problem.

What happens if you don't change the thermostat?

The consequences depend on the nature of the malfunction:

  • 🔥 Closed thermostat → overheating → cylinder head deformation, gasket burnout, engine seizure.
  • ❄️ Open thermostat → long warm-up → increased engine wear, poor stove performance, increased fuel consumption.