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Infiniti M45 A/C Refrigerant Temperature Sensors

Infiniti M45 A/c refrigerant temperature sensors

Starting at $7.95, AutoBuffy stocks 2 A/C refrigerant temperature sensors from UAC. This sensor monitors refrigerant temperature inside the A/C system and sends data to the ECU to regulate compressor operation and prevent system damage. When it fails, the ECU loses critical feedback, often shutting the compressor down entirely and leaving the cabin warm.

Signs your Infiniti M45 needs a new A/C refrigerant temperature sensor

  • A/C blows warm or ambient air even when the system is switched to maximum cold
  • Compressor clutch engages briefly then immediately disengages or refuses to engage at all
  • A/C-related trouble codes stored — commonly a sensor circuit or out-of-range signal fault
  • Check engine or A/C warning light illuminated on the dashboard
  • A/C performance varies unpredictably, working intermittently before failing altogether
  • Visible corrosion, cracking, or a broken connector at the sensor body on the refrigerant line

Which A/C refrigerant temperature sensor should you buy for your Infiniti M45?

The most important factor is ensuring the replacement sensor matches the exact connector type, thread pitch, and resistance curve specified for your Infiniti M45's A/C control module. A sensor with the right physical fit but a mismatched resistance curve will send inaccurate readings and may keep triggering fault codes. Beyond fit, choose between OE-equivalent and OEM parts based on your budget and how long you plan to keep the vehicle.

OEM (dealer-sourced)
Best for
Owners who want an exact factory replacement with no calibration concerns
What you get
Guaranteed resistance curve and connector match; highest unit cost
OE-equivalent aftermarket
Best for
Most DIYers and shops looking for reliable daily-driver repair at lower cost
What you get
Meets or exceeds OEM specs; validated fit for Infiniti M45; sold by brands like UAC
High/discharge-side sensor
Best for
Systems where the high-pressure line sensor has failed (monitors refrigerant exiting the compressor)
What you get
Designed for elevated temperature and pressure range on the hot side of the circuit
Low/suction-side sensor
Best for
Systems where the low-pressure line sensor has failed (monitors refrigerant returning to the compressor)
What you get
Calibrated for the cooler, lower-pressure suction side; not interchangeable with high-side units

A/c refrigerant temperature sensors brands we stock for your Infiniti M45

UAC
2 options · from $7.95

Replacing an A/C refrigerant temperature sensor on a Infiniti M45

Moderate⏱ 30 minutes to 2 hours (add time if system evacuation and recharge are required)Digital multimeterOpen-end or flare-nut wrench setA/C manifold gauge set (if system must be evacuated)Electrical contact cleaner and dielectric greaseScan tool or OBD-II reader to clear fault codes

If the sensor mounts on a Schrader fitting, unplug the connector, unscrew the old sensor, and thread in the new one before reconnecting the harness — no refrigerant is lost. If the sensor sits in a sealed line or component, the system must be professionally evacuated first, the sensor swapped, and the system leak-checked and recharged before operation. After installation, clear stored fault codes and run the A/C to confirm the compressor cycles normally and no new codes appear.

Frequently asked questions

How much does it cost to replace A/C refrigerant temperature sensors on a Infiniti M45?
Parts start at $7.95 for an OE-equivalent sensor on a Infiniti M45. Professional labor typically adds one to two hours of shop time on top of the part cost, since the A/C system often must be evacuated and recharged if the sensor is located on a sealed refrigerant line rather than a Schrader-valve port.
Can I drive my Infiniti M45 with a faulty A/C refrigerant temperature sensor?
Yes, a failed sensor is not a safety hazard and the Infiniti M45 will drive normally. However, the ECU will likely disable the compressor as a protective default, so you will have no functional air conditioning. In hot climates this becomes a comfort and dehydration concern; the fault should be addressed before the next warm season.
Will replacing the sensor fix my Infiniti M45's A/C, or does the system also need a recharge?
A new sensor restores accurate temperature feedback to the ECU but does not add refrigerant. If the system is low on refrigerant — from a separate leak — the A/C will still underperform after the sensor is replaced. Confirm refrigerant level and system pressure are within spec before or after the sensor swap.
Do I need to evacuate the A/C system to replace the sensor on a Infiniti M45?
It depends on sensor location. Some refrigerant temperature sensors thread into a Schrader-valve fitting, letting you swap them without losing refrigerant. Others are installed directly in a refrigerant line or component that requires depressurizing the system first. Check the sensor's mounting point on your Infiniti M45 before starting the job.
How do I test an A/C refrigerant temperature sensor on a Infiniti M45 before replacing it?
Unplug the sensor and measure its resistance with a digital multimeter at a known ambient temperature, then compare the reading to the resistance-temperature chart in the service manual for your Infiniti M45. A reading that is open-circuit, short-circuit, or far outside the specified range at ambient temperature confirms the sensor has failed.
How long do A/C refrigerant temperature sensors last on a Infiniti M45?
Most sensors last the life of the vehicle under normal conditions, but heat cycling, vibration, and refrigerant contamination can shorten service life. Sensors on older Infiniti M45 models with original wiring are more vulnerable to connector corrosion and brittle insulation, which are the most common failure modes rather than the sensor element itself.

Shop a/c refrigerant temperature sensors by year for the Infiniti M45

2007200620042003

More parts for your Infiniti M45

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A/c refrigerant temperature sensors for other Infiniti models

Infiniti FX35Infiniti QX56Infiniti I35Infiniti J30Infiniti QX4Infiniti Q45