Nissan AD is a legendary SUV that is still used in harsh conditions, but even its reliable electrics fail over time. One of the common problems is the failure of the air conditioner, the culprit of which is often climate control relay. Owners are faced with the fact that the compressor does not turn on, the fan operates jerkily, or the system completely refuses to respond to commands. In this article we will look at how to independently find the air conditioner relay on Nissan AD, check its functionality and replace it without contacting service.

Feature AD (especially models WD21 And Y61) - a confusing circuit of fuses and relays, where one device can be responsible for several systems. For example, the air conditioning relay here is often combined with the radiator fan circuit, which complicates diagnostics. We have collected current data on the location of the relay for different years of manufacture, typical symptoms of malfunctions and step-by-step instructions with photos and diagrams.

Where is the air conditioner relay located? Nissan AD?

Depending on the year of manufacture and modification (WD21 1988–1997 or Y61 1997–2016) the air conditioning relay can be located in different blocks. Main options:

  • 🔧 Main fuse box under the hood (next to the battery) - here the relay is designated as A/C Relay or Compressor Clutch Relay. More common on AD Y61 after 2000.
  • 🚗 Block behind the glove box (passenger side) - relevant for early WD21. The relay can be combined with a 10A fuse.
  • ⚡ Additional block behind the glove compartment (on some versions with climate control) - here the relay is also responsible for the condenser fan.

To accurately identify a relay, pay attention to its markings. On original parts Nissan usually stated:

  • 📌 25230-4M000 or 25230-4M001 - for AD Y61;
  • 📌 25230-30X00 - for WD21 (until 1995).
📊 Where is your air conditioning relay located?
  • Under the hood
  • Behind the glove box
  • Behind the glove compartment
  • I don't know, I haven't looked yet

If there is no diagram on the block cover (and on old AD it is often erased), use multimeter in dialing mode: The A/C relay usually has 4 pins and is connected to the green/yellow wire harness (compressor power).

Symptoms of a bad air conditioning relay

Climate control relay on Nissan AD rarely fails suddenly - it is usually preceded by characteristic symptoms. Here are the key signs that the problem is in the relay, and not in the compressor or sensors:

  • ❄️ The air conditioner turns on once or only after several presses of the button A/C.
  • 🔄 The compressor clicks, but does not start (the sound of the clutch is heard, but the pulley does not rotate).
  • 💨 The radiator fan runs constantly, even when the air conditioner is turned off.
  • 🚨 The indicator lights up on the dashboard A/C, but no cold air comes.
  • 🔥 The air conditioner fuse (usually 10-15A) regularly blows.

Critical point: if, when you turn on the air conditioner, you hear the sound of the relay operating, but the compressor does not start, the problem in 90% of cases lies in burnt relay contacts or oxidized connectors. On AD Y61 this is often accompanied by an error P0530 (malfunction of the refrigerant pressure sensor circuit), although the relay is to blame.

⚠️ Attention: If the air conditioning compressor does not turn on, but the relay clicks, do not rush to change it. Check first freon pressure — if it leaks, the system automatically blocks the start of the compressor through a low pressure sensor.
Symptom Probable Cause Action
Relay does not click when turned on A/C Open control circuit or button malfunction Ring the wiring from the button to the relay
The relay clicks, but the compressor does not start Oxidation of relay contacts or open circuit Clean contacts or replace relay
The air conditioner works, but the radiator fan does not turn on Faulty fan relay (often combined with the air conditioning relay) Check the fuse FAN (10A)
Air conditioner fuse blows immediately after replacement Short circuit in the compressor or clutch circuit Diagnose the compressor and wiring harness

How to check the air conditioner relay for Nissan AD?

Relay diagnostics do not require special skills - a multimeter or even a simple 12V light bulb is enough. Here are the step-by-step instructions:

  1. Removing the relay: Carefully remove the relay from its socket (on some AD To do this, you need to press the lock with a flat screwdriver).
  2. External inspection: Check the contacts for oxidation, melting or cracks. If the relay housing is swollen, it definitely needs to be replaced.
  3. Winding continuity: Connect the multimeter in resistance mode to the contacts 85 And 86 (usually these are control pins). Resistance must be within 50–120 Ohm.
  4. Checking contacts: Apply 12V to the contacts 85 And 86 - there should be a click and the contacts 30 And 87 close (check with a multimeter in continuity mode).

Remove the relay from the socket|

Check the integrity of the case and contacts|

Ring the winding (50–120 Ohm)|

Apply 12V to the control contacts (there should be a click)|

Check the closure of the power circuit after operation-->

If the relay does not click when voltage is applied, it is faulty. Also note nest condition - Oxidized or burnt contacts in the fuse box can cause the same symptoms as a faulty relay.

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On Nissan AD Y61 After 2005, the air conditioning relay often “sticks” due to moisture getting into the fuse box. To avoid repeated damage, treat the socket contacts silicone grease or WD-40 (after cleaning).

Step-by-step replacement of the air conditioner relay

Replacing the relay with Nissan AD takes no more than 10 minutes, but there are nuances depending on the location of the block. You will need:

  • 🔧 Flat screwdriver (for block latches);
  • 🔌 New relay (original Nissan 25230-4M000 or equivalent TYCO V23134);
  • 🧴 Alcohol or contact cleaner (CRC);
  • 🔍 Flashlight (for inspecting the nest).

Instructions for AD Y61 (relay under the hood):

  1. Open the hood and locate the main fuse box (next to the battery).
  2. Remove the unit cover by pressing the latches on the sides.
  3. Find the relay marked A/C Relay (usually it is third from the right in the top row).
  4. Carefully remove the relay by pulling it up (do not use excessive force!).
  5. Clean the nest from dust and oxidation using alcohol and a brush.
  6. Install the new relay, making sure it is seated all the way.
  7. Check the operation of the air conditioner - the compressor should turn on 1-2 seconds after pressing the button A/C.

Instructions for AD WD21 (relay behind the glove compartment):

  1. Open the glove box and remove it by removing the 4 screws Torx T20.
  2. Behind the glove compartment you will see an additional relay box. The relay you are looking for is usually black with a green mark.
  3. Disconnect the unit connector by pressing the latch and remove the relay.
  4. Before installing a new relay, check the circuit for short circuit (see previous section).
⚠️ Attention: On Nissan AD with climate control (Y61 after 2003) after replacing the relay it may be necessary error reset via the diagnostic connector. If the air conditioner does not work, disconnect the battery for 5 minutes or use a scanner to reset the code P0530.

Which air conditioner relay to choose for Nissan AD?

Original relay from Nissan (article 25230-4M000) costs about 1,500–2,000 rubles, but it can be replaced with cheaper analogues. The main thing is that the relay meets the following parameters:

  • 🔌 Type: 4-pin, normally open (NO);
  • 📏 Dimensions: standard case 28.5×28.5×20 mm;
  • ⚡ Operating voltage: 12V;
  • 🔧 Switching current: not less than 30A (for compressor AD enough to spare).
Manufacturer Article Price, rub. Notes
Nissan (original) 25230-4M000 1 800–2 200 Best quality, long service life
TYCO V23134 400–600 Reliable analogue, used in auto electronics
Bosch 0 332 019 150 700–900 Suitable for AD Y61 with climate control
Hella 4RA 003 537-121 500–700 Good price/quality ratio

If you choose a non-original relay, please pay attention to quality of contacts - cheap Chinese analogues often have thin lamellas that quickly burn. The best option for AD - relay from TYCO or Bosch.

How to distinguish a fake relay?

Counterfeit relays are usually lighter than the original ones (weighing less than 30 grams) and have unclear markings. Also pay attention to the plastic - in originals it is matte and durable, in fakes it is often glossy and fragile. If there are traces of glue or uneven seams on the case, it is 100% counterfeit.

Common mistakes when replacing an air conditioner relay

Even such a simple operation as replacing a relay can result in new problems if mistakes are made. That's what can't do when working with the air conditioner relay on Nissan AD:

  • ❌ Ignore fuse check: If the fuse A/C (10A) has burned out, replacing it without diagnosing the circuit will lead to repeated failure.
  • ❌ Install the relay "by eye": Fan and air conditioning relay on AD They are similar in appearance, but have different markings. If you mix them up, you risk burning the compressor.
  • ❌ Do not clean the nest: Oxidized contacts in the fuse box will negate efforts to replace the relay.
  • ❌ Buy a relay without testing: Even a new relay can be defective. Always test it with a multimeter before installation.

Another common mistake is misdiagnosis. For example, if the air conditioner does not work due to a freon leak, replacing the relay will not help. Always start by checking:

  1. System pressure (should be 2.5–4.5 bar on the low pressure side).
  2. The performance of the pressure sensor (located on the air conditioner pipe).
  3. Integrity of wiring from relay to compressor.
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If after replacing the relay the air conditioner still does not work, check compressor clutch - on Nissan AD it often wears out and slips, simulating a relay failure.

Preventing problems with the air conditioner relay

To make the air conditioner relay on Nissan AD last longer, follow simple recommendations:

  • 🌡️ Check the freon level regularly: Low system pressure causes the compressor to work overload, which increases the load on the relay.
  • 🧹 Clean the fuse box: Dust and moisture are the main causes of contact oxidation. Once a year, remove the unit and blow it out with compressed air.
  • ⚡ Monitor the voltage of the on-board network: Voltage surges (for example, when lighting a cigarette) often damage the relay. Use a voltage stabilizer.
  • 🔧 Check the relay during seasonal maintenance: Before summer, test the air conditioner and relay with a multimeter.

On AD Y61 with climate control it is additionally recommended:

  • 🔄 Once every 2 years, update the firmware of the climate control unit (eliminates glitches with relay control).
  • 🛠️ Check status fan resistor (its failure can load the relay circuit).

If your Nissan AD is operated in conditions of high humidity (for example, in coastal regions), treat the contacts of the fuse box dielectric grease. This will prevent corrosion and extend the life of the relay.

FAQ: Frequently asked questions about the air conditioner relay Nissan AD

Is it possible to drive without an air conditioning relay?

Technically yes, but the air conditioning won't work. However, on AD Y61 The A/C relay is sometimes connected to the radiator fan circuit. If you remove the relay, the fan may not turn on, causing the engine to overheat. It is better to temporarily install a known good relay.

Why does a new relay burn out quickly?

This is a sign short circuit in the compressor or clutch circuit. Check:

  • The condition of the wiring from the relay to the compressor (often rubs against the body).
  • Serviceability of the compressor clutch (if it is jammed, the current increases sharply).
  • Integrity of insulation on the freon pressure sensor.

If the problem is not resolved, the short circuit can damage not only the relay, but also the climate control unit.

How to test a relay without a multimeter?

Can be used 12V light bulb:

  1. Connect the light bulb to the contacts 85 And 86 relay
  2. Apply 12V to these contacts (for example, from a battery).
  3. If the light comes on and the contacts 30 And 87 closed - the relay is working properly.

You can also simply swap the relay with a known working one (for example, a fan relay).

Which relay should I install if the original is too expensive?

The best analogues:

  • TYCO V23134 - reliable and inexpensive;
  • Bosch 0 332 019 150 — suitable for systems with climate control;
  • Hella 4RA 003 537-121 - good quality at an average price.

Avoid relays without markings or with inscriptions such as "Made in China" without manufacturer's logo.

What should I do if, after replacing the relay, the air conditioner still does not work?

Check:

  1. Freon pressure sensor — if the system is depressurized, the compressor will not turn on.
  2. fuse A/C — it could burn out when replacing the relay.
  3. Compressor clutch - if it is worn out, the compressor will not start.
  4. Climate control unit - on AD Y61 it may block startup due to errors.

If everything is fine, but the air conditioner is not working, check signals from the control unit (a diagnostic scanner is needed).