Question about Dodge Ram 2500

1 Answer

On the compressor cycle switch on the low side pressure of my a/c it has three wires.To make the compressor start which wires need to be jumped to make compressor run? it has low freon

Posted by on

  • 1 more comment 
  • Mike Pierce Apr 29, 2010

    I know it is low

    so which wires do you jump to start compressor?

    so I can add oil and freon?

    There are three wires ?

    which one gets jumped?

  • Mike Pierce Apr 29, 2010

    2006 dodge ram 2500 diesel megacab

  • Mike Pierce Apr 29, 2010

    Yes they suppied better answers for my problem
    the person yesterday is the one that told me to jump the switch and as i told them that a mechanic said it could not be jumped
    so i guess i will have to pay somebody to add freon to my truck instead of adding it myself :(

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,450 Answers

What year model, engine size? if you have low freon need to charge up switch is designed to cut out compressor so it doesnt get damaged from low refrigerant,as the oil is carried with refrigrant low freon means low oil traveling thu system

Posted on Apr 29, 2010

  • TripleTauto
    TripleTauto Apr 29, 2010

    you need to add freon. here is a diagram of the pressure switch.the switch controls a signal to the pcm. it is not really "jumpable" like old models you risk damaging pcm here is a description.....The A/C pressure transducer will change its internal resistance in response to the pressures it monitors. The powertrain control module (PCM) or the engine control module (ECM) (depending on engine application) provides a five volt reference signal and a sensor ground to the A/C pressure transducer, then monitors the output voltage of the transducer on a sensor return circuit to determine refrigerant pressure. The PCM/ECM is programmed to respond to this and other sensor inputs by controlling the operation of the A/C compressor clutch and the radiator cooling fan to help optimize A/C system performance and to protect the system components from damage. The PCM will disengage the A/C compressor clutch when high side pressure rises above 3172 kPa (460 psi) and re-engage the clutch when high side pressure drops below 1999 kPa (290 psi) . The A/C pressure transducer will also disengage the A/C compressor clutch if the high side pressure drops below 193 kPa (28 psi) and will re-engage the clutch when the high side pressure rises above 234 kPa (34 psi) . If the refrigerant pressure rises above 1655 kPa (240 psi) , the PCM will actuate the cooling fan. The A/C pressure transducer signal to the PCM/ECM will also prevent the A/C compressor clutch from engaging when ambient temperatures are below about 10°C (50°F) due to the pressure/ temperature relationship of the refrigerant. The A/C pressure transducer input to the PCM/ECM will also prevent the A/C compressor clutch from engaging when ambient temperatures are below about 10°C (50°F) due to the pressure/temperature relationship of the refrigerant.

  • TripleTauto
    TripleTauto Apr 29, 2010

    YOU should have r134a freon and you can add yourself once you hook can into low side it will allow enough in system to cut on but it is best to have gauges installed so you can see pressures.

×

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Location of the Ac low pressure switch 2007 Mkz


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?

26226098-ksqvf2f1jj4orad3gkvfxz23-1-0.jpg

Jun 26, 2016 | 2007 Lincoln MKZ

1 Answer

A/C compressor on 95 astro van does not engage at all.


There are a few reasons for the compressor not engaging. Lets start with the most common. low ac gas.A bad clutch on the compressor.Blown fuse.
Let is start with testing for low gas. (134a freon).Locate the dryer. this is on the passenger side of engine compartment. it looks like a tall cylinder, on the top side you will see a switch. unplug switch connector and jump the two terminals in connector with a piece of wire, this is the low pressure or cycling switch. you will be completing the circuit by jumping a wire across the terminals.If the compressor turns on when connectors are jumped then you are low on gas and the system needs recharging.
If the compressor does not urn on then check all fuses, if fuses are good then the next step is to go to compressor and test for power and ground. If you have power and a good ground on the connector to compressor then compressor clutch is bad.A bad clutch will some times blown fuses, so if you replace the fuse because it was blown and it blows again then clutch is bad.
Another test that will help is when you remove the connector from the cycling low pressure switch , test the connector. one wire on the connector should have power when ac is turned on,
Hope this helps let me know what the outcome is. Good day.
I have enclosed a picture of the switch and dryer to help you locate it.If you jump the terminals

Mar 23, 2012 | 1995 Chevrolet Astro

3 Answers

Replaced the ac compressor but now no power to compressor but have power to low and high pressure switches. checked relay under hood, relay and fuse in cabin. what am i missing?


Put a jump wire in the high pressure switch plug. If the compressor works. replace the high pressure switch. Let me know and we can go from there.

Aug 22, 2011 | 1999 Ford Expedition

1 Answer

To add 134a, which of three wires on the pressure switch should I jump to get the compressor to run to add freon?


you don't need to jump the wires. even if the compressor clutch is not turning add the refrigerant to the low side port, it will go in through its own pressure when a safe level for the compressor to run has been reached the clutch will engage. at first the clutch will spin a second or two and stop and then begin again, from there continue adding refrigerant the clutch should spin continuously. if the clutch fails to ever engage the compressor is bad or there is a wiring problem.

May 12, 2011 | 2005 Chrysler Pacifica

1 Answer

My 2001 maxima a/c does not cool. checked pressure is full, compressor does not engage, relay is ok, when relay is taken out and bridge with a wire compressor comes ON and a/c cools. can someone help...


Find the low pressure cycling switch or it can be named clutch cycling switch, the switch your looking for is the low pressure switch jump that and if it come on replace the switch it , it is on the low presssure side,

May 08, 2011 | 2001 Nissan Maxima

1 Answer

Air conditioning compressor not getting power on 96 Chevy Tahoe


Freon is what you are missing, our more specificly a refigerant charge that exceeds 45psi on the low side pressure line. This system has two pressure switches, a high side cut-out switch mounted on the rear of the compressor, and a low side or pressure cycling switch on the suction line.
Jump the low side switch contacts to ensure the electronics are sound for this system. If the compressor cycles, you know the system is low on a refrigerant charge. Turning on the AC is a request, and certain criteria must be met before the system operates as designed. Good luck

Mar 12, 2010 | 1996 Chevrolet Tahoe

2 Answers

I have a 1996 geo tracker I cant get the compressor to run I have relpaced the compressor relay which dosent help. freon is ok compressor cluch kicks in when direct wired.


does the compressor run when bypass the compressor thermal cutout switch on the compressor? here is the part number and a picture.
also does it run when u bypass/jump the compressor cycling switch? it is located in the low side of the sytem, thios is the line that is the larger of the two, hwere is the part # and picture.

1. compressure cutout switch (3 diff ones used)
FOUR SEASONS Part # 35756
Compressor Mounted Cut-Out Switch; 1 Term White
type two
FOUR SEASONS Part # 35973
Compressor Mounted Cut-Out Switch; 2 Term; Blue or Green; Low Pressure
type 3
FOUR SEASONS Part # 35970
Compressor Mounted Cut-Out Switch; 2 Term; Yellow

d2d2a20.jpgthis is type one and two, two wires.

next is type 3 one wire.
06d325f.jpg Next is the low side compressor cycling switch, most common problem.

ACDELCO Part # 155606 {#96069320}
SWITCH,A/C CYCLING

2c15c22.jpg

Nov 02, 2009 | 1996 Geo Tracker 2 Door

1 Answer

Have a 2003 stratus with intermittent A/C works great when on, where is the pressure sensor located?, that may be problem


On this Chrysler product they have an A/C Transducer located on the high pressure hose. The switch has three wires. They also have a thermo sensor located at the evaporator case behind the glove compartment. These two things are the only ones thatA jump in the system is only removing protection the system has. So it will damage your compressor or hoses. Find the compressor follow the high hose to the high pressure switch (transducer) it has three wires. Check under the dash by the glove box and you will see a round platick lid on the case with two wires that is your thermostat (thermo sensor).
control the compressor.

The A/C clutch is controlled by the A/C cycling switch (19E561) and the A/C pressure cut-off switch, which are connected in series. The A/C cycling switch is mounted on the suction accumulator/drier (19C836), and the A/C pressure cut-off switch is mounted in the discharge line at the A/C condenser.

The A/C cycling switch closes when the pressure on the low side of the system reaches approximately 276-324 kPa (40-47 psi). The A/C cycling switch opens when the pressure drops to approximately 163-175 kPa (23.5-25.5 psi), disengaging the A/C clutch. In ambient temperatures below -1° C (30° F), the A/C cycling switch will not allow compressor operation because of low system pressures.

The A/C pressure cut-off switch is used to interrupt A/C clutch operation in the event of high system discharge pressures. The A/C pressure cut-off switch is a single-function switch that controls A/C clutch engagement. When compressor head pressures rise to approximately 2896 kPa (420 psi), the contacts open, disengaging the A/C clutch. When the pressures drop to approximately 1724 kPa (250 psi), the contacts close to allow A/C clutch operation.

This problem can be caused by low refrigerant charge. Check with a manifold gauge set and temperature pressure chart.
The cycling switch is replaceable and there is a Schrader valve on the accumulator port so you do not lose your system charge when replacing. It screws on/off. It is available at any auto parts store. It protects the compressor from low pressure which can be caused by a loss of refrigerant and subsequent lack of lubrication and prevents evaporator freeze up. Replace the switch. It is about $10. The high presure switch is about $25.

Aug 26, 2009 | 2003 Dodge Stratus

2 Answers

A/C clutch will not engauge


i am not sure on this vehicle but it is usually right on the compressor..

Aug 01, 2009 | 1996 Chrysler LHS

2 Answers

I need to know how to jump the ac low pressure to get my ac compressor to come on.


If you look on the low pressure side of the AC system you will see a plug that is incorporated in to the line. It will have two wires leading to it. Remove the plastic clip that attaches the two wires to the sensor and use a short piece of wire to connect the two terminals in side the plug by putting the ends into the cap. This will bypass the low pressure sensor and allow the AC clutch to engage and begin to cycle again. Remember this low pressure switch is there for a reason. If you don't add more r-134 to the system and allow the AC compressor to cycle you will destroy the compressor. You need to charge the system when you bypass the low pressure switch and get the system up to full charge status and reconnect the switch.

May 24, 2009 | 1995 Chevrolet Camaro

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

113 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dodge Experts

yadayada
yadayada

Level 3 Expert

76649 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8518 Answers

Are you a Dodge Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...