Sidetracked Question
Thread Starter
MBWorld Fanatic!
Joined: Oct 2010
Posts: 5,141
Likes: 1,293
From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
Sidetracked Question
I know this is far fetched question, but are there any Infiniti drivers amongst us here in the forum?
I just purchased a 2014 QX60 for my grandson and the a/c quit two days after the deal.
System has plenty charge so the first thought is if the low side pressure switch is bad but we have trouble locating the switch.
I also cannot find any real info for the switch location in the net anywhere. Just the general bs about how if should be somewhere in the suction side line between the compressor and the evaporator.
If there are any members here who would also know about the issue above and point me in the right direction. Already tried Infiniti forum and found it useless.
Sorry mixing this Japanese made in America to our forum but thought someone here could perhaps help.
I just purchased a 2014 QX60 for my grandson and the a/c quit two days after the deal.
System has plenty charge so the first thought is if the low side pressure switch is bad but we have trouble locating the switch.
I also cannot find any real info for the switch location in the net anywhere. Just the general bs about how if should be somewhere in the suction side line between the compressor and the evaporator.
If there are any members here who would also know about the issue above and point me in the right direction. Already tried Infiniti forum and found it useless.
Sorry mixing this Japanese made in America to our forum but thought someone here could perhaps help.
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Joined: Jan 2018
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2006 S350L
https://www.youtube.com/watch?v=di_fnTDTWGsHere’s what I found:
That clip clearly shows the low‑pressure service port, which is on the larger-diameter suction line running from the compressor toward the evaporator—this same layout applies to the 2014 QX60.(YouTube)
Given what you've done (new compressor, condenser and correct charge), I’d recommend:
🎥 Visual Guide
Forward-facing 2013‑20 QX60 A/C Low‑Pressure Service Port LocationThat clip clearly shows the low‑pressure service port, which is on the larger-diameter suction line running from the compressor toward the evaporator—this same layout applies to the 2014 QX60.(YouTube)
🔧 Locating the Low-Side Pressure Switch
- Likely position: The low‑pressure switch is mounted along the low‑pressure suction line, typically between the compressor and the evaporator or near the accumulator. It connects to the larger tubing.(CarParts.com, anewwayforward.org)
- It’s often installed just downstream of the refrigerant accumulators on the suction line, sometimes near or integrated with the service port—but not always.(CarParts.com)
⚠️ Why Some Folks Can't Find It
Enthusiasts on Infiniti owner forums report replaced compressors and condensers with correct pressures still producing hot air—even after recharging properly. That suggests:- Possible restrictions upstream (expansion valve)
- Blend-door or sensor failures
But one consistent theme: they rarely mention pressure switch failure outright, perhaps because they likely reside in tight or hard-to-access spots.(infinitiqx60.org)
🛠 Testing or Ruling Out the Switch
If you suspect the switch:- Get the AC up and running (engine on, A/C activated).
- Use a scan tool (or gauge set) to verify pressure thresholds.
- Test the electrical connector using a multimeter:
- Measure resistance or continuity across switch wires.
- Some reported values ~3.5 Ω, others ~38 Ω—usually high resistance indicates a bad switch.(anewwayforward.org, JustAnswer, CarParts.com, JustAnswer)
- Measure resistance or continuity across switch wires.
- For diagnostic purposes, you can temporarily bypass the pressure switch by shorting the appropriate circuit wires—but only for a quick bench-check (and remove once done to avoid damage).(JustAnswer)
✅ Summary Table
Task Steps Locate Switch Follow the larger suction line (low side) from compressor toward firewall; look for a small block or sensor on the tube Test Switch Check resistance/continuity across wire connector; bypass momentarily if safe Check System Confirm static and running pressures match specs (typically ~25–45 psi at low side); verify compressor clutch gets 12 V from IPDM (underhood fuse box) Consider Other Faults If pressures and switch check out, investigate restrictions (expansion valve), TXV, evaporator sensor, or blend door issues📝 Final Thoughts
You're not alone—many 2014 QX60 owners have struggled with locating and diagnosing the low-pressure switch. It's tucked along the suction line, but diagrams are scarce.Given what you've done (new compressor, condenser and correct charge), I’d recommend:
- Focus first on verifying switch operation (OHMs and bypass test).
- If the switch checks out, look next at flow restrictions like expansion valve or blend-door/climate system faults, which are common in persistent hot‑air cases.(JustAnswer, JustAnswer, infinitiqx60.org, carfixdiy.com)
Thread Starter
MBWorld Fanatic!
Joined: Oct 2010
Posts: 5,141
Likes: 1,293
From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
https://www.youtube.com/watch?v=di_fnTDTWGsHere’s what I found:
That clip clearly shows the low‑pressure service port, which is on the larger-diameter suction line running from the compressor toward the evaporator—this same layout applies to the 2014 QX60.(YouTube)
Given what you've done (new compressor, condenser and correct charge), I’d recommend:
🎥 Visual Guide
Forward-facing 2013‑20 QX60 A/C Low‑Pressure Service Port LocationThat clip clearly shows the low‑pressure service port, which is on the larger-diameter suction line running from the compressor toward the evaporator—this same layout applies to the 2014 QX60.(YouTube)
🔧 Locating the Low-Side Pressure Switch
- Likely position: The low‑pressure switch is mounted along the low‑pressure suction line, typically between the compressor and the evaporator or near the accumulator. It connects to the larger tubing.(CarParts.com, anewwayforward.org)
- It’s often installed just downstream of the refrigerant accumulators on the suction line, sometimes near or integrated with the service port—but not always.(CarParts.com)
⚠️ Why Some Folks Can't Find It
Enthusiasts on Infiniti owner forums report replaced compressors and condensers with correct pressures still producing hot air—even after recharging properly. That suggests:- Possible restrictions upstream (expansion valve)
- Blend-door or sensor failures
But one consistent theme: they rarely mention pressure switch failure outright, perhaps because they likely reside in tight or hard-to-access spots.(infinitiqx60.org)
🛠 Testing or Ruling Out the Switch
If you suspect the switch:- Get the AC up and running (engine on, A/C activated).
- Use a scan tool (or gauge set) to verify pressure thresholds.
- Test the electrical connector using a multimeter:
- Measure resistance or continuity across switch wires.
- Some reported values ~3.5 Ω, others ~38 Ω—usually high resistance indicates a bad switch.(anewwayforward.org, JustAnswer, CarParts.com, JustAnswer)
- Measure resistance or continuity across switch wires.
- For diagnostic purposes, you can temporarily bypass the pressure switch by shorting the appropriate circuit wires—but only for a quick bench-check (and remove once done to avoid damage).(JustAnswer)
✅ Summary Table
Task Steps Locate Switch Follow the larger suction line (low side) from compressor toward firewall; look for a small block or sensor on the tube Test Switch Check resistance/continuity across wire connector; bypass momentarily if safe Check System Confirm static and running pressures match specs (typically ~25–45 psi at low side); verify compressor clutch gets 12 V from IPDM (underhood fuse box) Consider Other Faults If pressures and switch check out, investigate restrictions (expansion valve), TXV, evaporator sensor, or blend door issues📝 Final Thoughts
You're not alone—many 2014 QX60 owners have struggled with locating and diagnosing the low-pressure switch. It's tucked along the suction line, but diagrams are scarce.Given what you've done (new compressor, condenser and correct charge), I’d recommend:
- Focus first on verifying switch operation (OHMs and bypass test).
- If the switch checks out, look next at flow restrictions like expansion valve or blend-door/climate system faults, which are common in persistent hot‑air cases.(JustAnswer, JustAnswer, infinitiqx60.org, carfixdiy.com)
All generic info says lo side switch is where it normally in a/c systems is but in this car it is hidden very well if it has one. That is why I ask if there are any Infiniti drivers who actually know where it is.
Super Member
Joined: Jun 2025
Posts: 784
Likes: 249
From: USA
The low-pressure switch on a 2014 QX60 is usually on the suction line near the compressor or firewall. Check near the accumulator it may be built into the line. If the system is charged but the AC isn’t working, test the switch or wiring with a multimeter.
Thread Starter
MBWorld Fanatic!
Joined: Oct 2010
Posts: 5,141
Likes: 1,293
From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
But I have to locate that switch first.
I'm starting to think there is no Lo side switch but just one switch on Hi side that serves for both Hi and Lo pressure conditions. This is the 3-wire switch mounted in the side of the condenser in front of the car.
Infiniti parts diagram only shows one pressure switch/transmitter. It does not show one in the low side line.
But I did not want to start a big thread about a car that is not even a Mercedes. Just took a chance if someone here had one and experienced a/c issues with it as it also is kind of a luxury vehicle...
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1983 Nissan Shltbox
