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Where is low pressure switch located for the A/C Compressor

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It is located under the three wire wiring harness located behind the ac hose connection next to the passenger side of the firewall.

Posted on Jun 20, 2009

  • veedubwifey May 03, 2011

    Thanks soooooo much! I looked everywhere for this info



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Posted on Jan 02, 2017

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SOURCE: Air conditioner intermittently works. check low

I haven't found a really good wiring schematic of the A/C on these cars. But, I can tell you that I had an intermittant problem with my Civic air conditioner that sounds similar to yours.
Mine would work fine in cool and warm weather, but when the outside temperatures got hot, it would quit working. The fan would blow; the system had a good charge on it; and the green A/C indicator light on the A/C on/off switch showed the system as being "on". Despite all the indicators saying the A/C is "on", the compressor clutch wouldn't come on when the weather got hot.
In my case, the reason it stopped working when hot, was due to some poor solder connections at the A/C on/off switch, which is part of the Heater Control Assembly.
I removed my Heater Control Assembly (challenging job), and pulled apart the Heater Control Assembly (more challenging) to access the solder connections for the A/C on/off switch. I resoldered those connections (six solder points) and put everything back together and everything has worked perfectly ever since that time (two years).
I have never seen a wiring schematic that shows this switch with more than three connections, and that is why I haven't posted a schematic for you. If you want the usual schematic(s), you can find one on for your Honda.
If you are not comfortable pulling apart the Heater Control Assembly, and soldering those connections, you can install a new assembly which is available on-line. I saw one listed through Majestic Honda for about $240.
I hope this helps.
Good Luck, Mark

Posted on Aug 01, 2009

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SOURCE: ac doesn't work

suggest taking a multi meter reading across the terminals of the ac compressor . if you get infinti"no reading" then your engage coil is not working. if you follow the lager insulated pipe for the air conditioning you will eventually come across the low pressure switch
hope this helps

Posted on Apr 28, 2009

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SOURCE: I need a wiring diagram for the ac to find the high and low pressure valve and the compressor switch .

No you don't. The hi/lo awitch is on the tubing at the drier.

Posted on Jun 27, 2009

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SOURCE: I cannot locate my low pressure switch on 1995 Corsica.

First of all, from the discharge port of compressor to the condenser(the device in front of the radiator) from the condenser to the metering device is all the high side or high pressure. From the metering device through the evaporator including accessories back to intake of compressor is the low side or low pressure.It is important to know that entrained in the refrigerant is oil for lubrication. The combination of pressure and oil could be a safety and environmental hazzard. I know on older GM models one could short out low pressure switch by jumping the low pressure switch with appropriate gage wire. This would temporarily permit one to add aditional refrigerant to system.The job of the low pressure switch is to protect the compressor from burning up due to lack of refrigerant by shutting the system down.. Now, if the refrigerant is low it had to escape, meaning a leak.(refirerants don't just wear out)Refrigerants are notorious to being determental to the environment. Older refrigerants contained hydrocarbons that destroyed or reduced the ozone levels to reduce this from happening strict laws of handling and recovering a/c refrigerants were enacted & exhorbitant costs were placed on the offending refrigerants.In order to save some some money some untrained or knowledgeable people are continuing attempting to repair their systems risking injury like permanent eye injury.Is it worth it? No one (I believe ) intentionally desires to be hurt.However, by attempting to do something that you haven't been trained on can make you more susceptable to injury or accident. An in a instan one could trade off perfect vision to partial or even total blindness.This is not to just to scare you but gives you an opportunity to weigh all the decisions prior to attempting something one might be unfamiliar with.Most of the accidents I've witnessed at home and work were individuals taking short cuts,hurrying or attempting something unfamiliar with.Not all accidents fall into this category but be aware rehab is no fun and often not totally complete. Lets not compromise your safety and the well being of our environment.

Posted on Jul 05, 2009

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SOURCE: 1992 gmc c1500 ac compressor relay location

I pulled this from another web site
"The AC clutch relay is located inside the cab on a metal bracket that is easiest to see when you remove the glove box compartment.

The relay is on a metal bracket bolted to the top of the plastic air box, forward and to the center of the dash from glove box.

There are three relays in a row on that bracket. The AC clutch relay is the end one closest to the driver’s side."

Posted on Aug 18, 2009

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The low pressure switch (also known as the AC compressor switch) will be under the hood, it will be located in the low side AC line from the AC compressor, this is the larger of the two lines from the AC compressor. See picture below, looks like it has a three wire connector. Also what is the AC doing that makes you think this switch is defective? Cycling on and off constantly?


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Where exactly is the high pressure switch A/C is blowing warm air...I jumped the low pressure switch on the accumulator and the compressor cuts out at 40...on the gauges...

If the high side switch was bad, the compressor would come on at all. The low side is only on with the compressor running. You need a set( high and low) gauges on it to determine the problem.

Oct 25, 2015 | Cars & Trucks

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Just replaced ac compressor and still not working. replaced a relay also. What would keep itfrom coming on?

Could have a faulty low pressure switch.
The low pressure switch is located on the air conditioning line in the right rear of the engine compartment near the firewall.

The low-pressure switch in your air conditioning system is used to interrupt power to the compressor when the low side pressure drops below 25 psi. This prevents freeze-up of the system and possible damage to the compressor. When the switch is faulty, the symptoms of freeze-up, or no compressor function, will be present. Replacement is straightforward, but requires the removal of refrigerant from the system.

Jul 03, 2015 | 2003 Kia Sorento

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High and low pressure switches

The high pressure switch is usually located on the a/c compressor. If pressure gets to high on the high side the switch will open and turn off the a/c compressor. It is a normally closed switch. The low pressure switch is usually located on the lager of the two lines, or on/near the accumulator (also known as the receiver drier). It's function is to turn off the a/c compressor if pressure gets to low. It is a normally open switch that requires a minimum pressure in order to close.

I’m happy to assist further over the phone at

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Charged a/c system no leaks compressor would not kick on held 30 minute vaccuum checked for leaks replaced condensor due to hitting a coon could not find low pressure switch to jump to kick compressor on

turn ac on with engine running check for power at the compressor if there isnt check for power at the low pressure switch if there is jump out the connection
the compressor should turn on the low pressure switch is usually located on the accumulator canister (SILVERY CANISTER) near the firewall.

May 04, 2010 | 2005 Pontiac Grand Am

1 Answer

Where can i find the Low pressure switch on my 92 nissan pathfinder. and how can i check to see if its bad or switch it on?

The low pressure switch in an A/C system cannot be manually "switched" on or off.
most A/C systems have 2 switches. Both of these switches are "switched" by the pressure of the freon in the system.
One is located on the high side of the system, and the other is on the low side of the system. The one located on the high side is a normally closed switch that opens the A/C clutch circuit and shuts the compressor off when the high side pressure gets dangerously high - usually around 350 - 400 PSI. This keeps you from having an explosion in the event that the hoses become restricted for any number of possible reasons.
The low pressure switch opens the A/C clutch circuit and shuts the compressor off when there is not enough pressure on the low side of the system to safely operate the system. usually somewhere around 20 PSI. The compressor is oiled by oil circulating along with the freon in the system. If the freon leaks out, the pressure drops and the oil cannot circulate because there is not enough freon to push it through the system. So the low pressure switch shuts the compressor off to keep the compressor from blowing up due to oil starvation.
Failure of these switches is very rare. Almost every one that I have replaced was not because the switch didn't switch, but because it was leaking freon.
If your low pressure switch is keeping your A/C compressor from running, it is most likely that the system is either out of freon (due to a leak somewhere in the system) or because it is unplugged.
Your Nissan is equipped with a "Dual Pressure" switch. it does the job of both switches by opening under extremely high pressure as well as extremely low pressure conditions. it is located beween the front grill and the A/C condensor near the Accumulator just to the right (as you are facing the front of the car) of the right headlamp area. See picture.50e4218.gif To determine if this switch is functioning properly, you must hook-up an A/C pressure manifold gauge (to find out what the actual system pressure is) and use a volt/ohm meter to determine if the switch is opening and closing under the correct pressures.

Oct 10, 2009 | 1992 Nissan Pathfinder

2 Answers

Where is low pressure connector located on the

The low pressure service gauge port valve is located on the manifold of the A/C compressor manifold and tube assembly at the A/C compressor

Jun 26, 2009 | 2000 Lincoln LS

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Compressor will not turn off but cannot find the location of the low pressure switch to change it. blows cold but will not cycle off...

there is a thermistor switch located in evaporator case(thin black single or 2 wires) that makes the compressor cut in and out (cycle) it monitors evaporator temperature.
check head pressures with air cond charging station or gauge set and monitor pressure on high and low side (150-200kpa on low, 1500-1800kpa on high good average depending on ambient temp) if it is low on gas due to leak this can also keep compressor running longer due to evaporator temp not reaching lowest threshhold to cut compressor out

Jun 13, 2009 | 1998 Chevrolet S-10 Pickup

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