Why the owners Almera N16 remove the air conditioner and how it affects the drive belt

Many owners Nissan Almera N16 (2000–2006) are faced with the need to dismantle the air conditioner - be it due to its malfunction, a freon leak, or a desire to simplify the engine design. However, after removing the compressor, a problem arises: the standard serpentine belt becomes too long, starts to slip or falls off completely. The solution is to install air conditioner bypass belt, but there are nuances here.

The point is that on Almera N16 with engines QG15DE (1.5 l) and QG18DE (1.8 L) drive belt pattern is different. For example, on the version with power steering (power steering) and with air conditioning, the belt goes around 4 pulleys, and without air conditioning - only 3. Incorrect selection of the belt length leads to its rapid wear, whistling or breakage. In this article we will look at how to avoid mistakes and choose the best option.

Important: if you plan temporary driving without air conditioning (for example, in winter), you can get by by tensioning the standard belt using tension roller. But this approach is not suitable for constant use - the belt stretches, and the load on the generator and pump increases.

Which belts are suitable for Almera N16 without air conditioning: compatibility table

The choice of belt depends on the vehicle configuration. Below is a table with tested dimensions for different configurations. Please note: length is indicated according to outer diameter (For example, 6PK995 - this is a belt with 6 strands and a length of 995 mm).

Engine Availability of power steering Standard belt (with air conditioning) Air conditioner bypass belt Article (example)
QG15DE (1.5 l) Without power steering 6PK1020 6PK940 Gates 6PK940, Contitech 6PK940
QG15DE (1.5 l) With power steering 6PK1115 6PK1030 Dayco 6PK1030, Bosch 6PK1030
QG18DE (1.8 l) Without power steering 6PK1075 6PK995 Mitsuboshi 6PK995, SKF VKM 6PK995
QG18DE (1.8 l) With power steering 6PK1190 6PK1115 Gates 6PK1115, Optibelt 6PK1115

⚠️ Attention: If on your Almera N16 installed electric power steering (EPS), the belt diagram coincides with the “without power steering” option. Check this before purchasing!

When choosing a belt, give preference to brands Gates, Contitech or Dayco — they guarantee a resource of up to 60–80 thousand km. Cheap analogues (for example, Fenox or Finwhale) can stretch after 20 thousand km, which will lead to slippage and battery undercharging.

📊 What belt do you use on your Almera N16?
  • Standard (with air conditioning)
  • Short (bypassing the air conditioner)
  • Universal (trimmed)
  • I don't know

Step-by-step instructions for replacing the belt bypassing the air conditioner

To replace the belt you will need:

  • 🔧 12 mm wrench (to loosen the tension roller).
  • 🔧 10 mm wrench (for attaching the generator).
  • 🔧 Mounting spatula or extension pipe for the lever.
  • 🔧 New belt (selected from the table above).

Algorithm of actions:

  1. Loosen the tension roller. Turn the pulley bolt counterclockwise (12mm wrench) to release the belt. If the roller is soured, treat it WD-40 10–15 minutes before work.
  2. Remove the old belt. Carefully slide it off the alternator, pump and crankshaft pulleys. If the belt is stuck, pry it out with a screwdriver (but do not damage the straps!).
  3. Install a new belt. Start with the crankshaft pulley, then slide it onto the pump, alternator, and (if equipped) the power steering pulley. Make sure the belt lies in the streams without distortions.
  4. Pull the belt. Turn the tension roller clockwise until the belt bends 5–7 mm when you press with your finger between the generator and pump pulleys.

Inspect the belt for cracks and distortions|

Make sure the belt does not touch the guard|

Check tension (5-7mm deflection)|

Tighten all bolts (roller, generator)|

Start the engine and listen for whistling-->

⚠️ Attention: If after replacing the belt whistles on cold start, this could mean:

  • 🔴 Weak tension (pull up the roller).
  • 🔴 Oil or coolant gets on the belt (wipe with alcohol).
  • 🔴 Poor quality belt (replace with a branded one).
💡

If the belt comes off the pulleys, check the alignment: a worn pump or alternator bearing is often the cause. Replace them before installing a new belt.

Typical mistakes when installing a belt without air conditioning

Even experienced car owners make mistakes that lead to rapid belt wear or component failure. Here are the most common:

  1. Using a "universal" belt. Some people try to cut the standard belt or use a belt from another model (for example, from Nissan Primera P12). This leads to uneven wear of streams and slippage.
  2. Belt tightening. Excessive tension increases the load on the generator and pump bearings, reducing their service life. Optimal deflection - 5–7 mm when pressed with a force of 10 kg.
  3. Ignoring the state of the rollers. If the tension or idler roller is loose or makes noise, it needs to be replaced. to installing a new belt. Otherwise, the belt will vibrate and wear out quickly.
  4. Wrong dressing pattern. On Almera N16 the belt should go with the power steering after the power steering pulley, and not before it. An error leads to distortion and whistling.

⚠️ Attention: If after replacing the belt the light on the dashboard comes on battery or engine overheating, turn off the engine immediately! This is a sign that the belt is not turning the alternator or pump pulley. Check tension and correct installation.

What happens if you drive with a stretched belt?

Long-term operation with a loose belt leads to:

- **Battery is undercharged** (the generator is running at half capacity).

- **Engine overheating** (the pump rotates more slowly, the circulation of antifreeze worsens).

- **Breakage of the belt** on the way, which can lead to jamming of the pump or generator (repairs will cost 10–15 thousand rubles).

How to check belt tension without special tools

In service centers, they use strain gauge, but in garage conditions you can get by with improvised means. Here are 3 reliable methods:

  1. Deflection check.
    • Press the belt with your finger between the generator and pump pulleys.
    • Optimal deflection - 5–7 mm with a force of ~10 kg.
    • If the deflection is more than 10 mm, the belt is weak, less than 5 mm, it is overtightened.
  2. Whistle test.
    • Start the engine and turn on the maximum load (headlights, heater, heated windows).
    • If the belt whistles more than 2–3 seconds - it needs to be tightened up.
  3. Visual inspection.
    • With the engine running, shine a flashlight on the belt.
    • If he vibrates or moves in streams - adjustment required.

💡 Advice: After adjusting the tension, do check ride for 5–10 km, then recheck the deflection. New belts often shrink during the first hours of use.

💡

On Almera N16 with air conditioning and power steering, you cannot use a belt shorter than 6PK1030 - this will lead to excessive tension and damage to the bearings.

What to do if the belt bypassing the air conditioner does not fit in length

Sometimes even a correctly selected belt may not fit into place. Causes and solutions:

Problem Possible reason Solution
Belt is too long Error in selection (for example, they took 6PK1030 instead of 6PK995) Check the article number in the table above. If the belt is new, exchange it in the store.
Belt is short (cannot be worn) The equipment was incorrectly taken into account (for example, the presence of power steering) Check to see if your car has power steering. If yes, take a belt 80–100 mm longer.
The belt falls off the pulleys Pulley misalignment or bearing wear Check the alignment of the generator and pump pulleys. If there is play, replace the bearings.
The belt "chews" streams Dirt or oil on the pulleys Clean the pulleys with alcohol or gasoline. If the streams are heavily worn, replace the pulleys.

If you are not sure about the choice of belt, take it with you to the store old belt — sellers will be able to select an analogue based on the actual length. You can also measure the length with a tape measure, wrapping it around the pulleys along the path of the belt (add 10-15 mm for tension).

⚠️ Attention: Never use belts with cracks or delaminations, even if they fit true to size. Microcracks lead to breakage under load, which Almera N16 fraught engine overheating (due to pump stopping) or battery discharge (if it flies off the generator pulley).

Alternatives: Is it possible to drive without an air conditioning belt?

Some car owners wonder: is it even possible? remove the air conditioner belt, leaving only the generator and pump drive? Technically this is possible, but there are some nuances:

  • ✅ Pros:
    • The design is simplified (fewer parts = less breakdowns).
    • Eliminates the risk of the air conditioning compressor jamming.
  • ❌ Cons:
    • On Almera N16 with QG18DE The pump pulley rotates from the timing belt, not from the drive belt. If the alternator belt falls off, the pump will continue to work, but the generator will stop charging the battery.
    • On QG15DE the pump is driven by a drive belt. Without it the engine will overheat in 10–15 minutes.
    • A missing air conditioning belt may cause vibrations at idle speed (due to pulley imbalance).

🔹 Conclusion: On Almera N16 with engine QG15DE driving without an air conditioner belt unacceptable - this will lead to overheating. On QG18DE You can temporarily drive without a belt (for example, until repairs), but the generator must work properly.

If you decide to completely remove the belt, close the air conditioner pulley a protective casing or plastic cover to prevent dirt and moisture from entering the bearing.

FAQ: Frequently asked questions about the air conditioner bypass belt on Almera N16

Can I use a belt from another Nissan model?

Yes, but with reservations. For example, a belt from Nissan Primera P12 (6PK1030) suitable for Almera N16 1.5 with power steering, but maybe a little longer. Please check the compatibility chart or measure your old belt before purchasing.

How often do you need to change the belt when bypassing the air conditioner?

Resource of a quality belt (Gates, Contitech) - 60–80 thousand km. However, check its condition every 20 thousand km: cracks, delamination or shiny areas (a sign of slipping) are a signal for replacement.

The belt whistles after replacement - what to do?

Reasons for whistling:

  1. Weak tension (tighten the roller).
  2. Moisture or oil ingress (wipe belt and pulleys with alcohol).
  3. Worn pulleys (replace them).
  4. Poor quality belt (replace with a branded one).

If the whistle appears only during a cold start, this is normal (the belt stiffens in the cold).

Is it possible to put a belt shorter than in the table?

No! A belt that is too short creates excessive tension, which leads to:

  • Wear of generator and pump bearings.
  • Belt breaks under load.
  • Increased fuel consumption (the engine operates under increased load).

Deviation from the recommended length is allowed no more ±10 mm.

Do I need to change the tension pulley when replacing the belt?

Required if:

  • The roller is loose or noisy when rotating.
  • It shows signs of wear (wear, cracks).
  • The belt has previously fallen off or squealed.

Cost of a new video (NTN or SKF) - about 800–1200 rubles, but its resource coincides with the life of the belt. The savings here are unjustified.