Why is there no power to my AC compressor?

No 12 volts at comp plug. Went to heater control panel, have 12 V at ac switch, (with blower on) and so switch is sending it down the line but where it goes to, I don’t know. Can’t find any fuse or breaker labelled AC.

How do I get power to my a / C compressor?

I get power everywhere except to the compressor and if i ground the # 87 pin on the relay it will engage the relay. I am out of ideas! Check all connections behind the controls for the HVAC in the cab. There is either a short or open wire between the AC switch and the relay.

What should the resistance of a compressor be?

If the compressor passes the above tests, take a multimeter set to R x 10,000 (10K) and check each winding to ground. You should have an infinite OL resistance to ground. A shorted motor will read 0 ohms across windings, to ground, or both.

Is there a fuse for the AC compressor?

Went to heater control panel, have 12 V at ac switch, (with blower on) and so switch is sending it down the line but where it goes to, I don’t know. Can’t find any fuse or breaker labelled AC. Tried running a separate set of wires directly to ac comp, it kicks in fine, draws 3.2 amps.

Can a cxu613 have no power to the AC compressor?

I’m working on a CXU613 Mack and it has no power to the AC compressor. All switches have been changed and there’s power everywhere but the compressor. Any suggestions? BMT Certified Know-It-All! does the a/c system have a charge in it? if not you may need to jumper the low pressure sw in order to run the comp. to fill the system.

When does my a / C compressor turn on or off?

Discussion in ‘ International Forum ‘ started by flatbed22, May 4, 2013 . Sometimes it will work for a 10 minutes and thats all. I took it to the T/A to get an A/C service. After checking the pressure he claims the compressor did turn on at 310 and turned off.

Is the AC in my truck not working?

Discussion in ‘ Peterbilt Forum ‘ started by kwforage, May 9, 2017 . 95’ 378. AC is not working. System is charged but compressor clutch will not engage.

Why is my AC compressor not getting power?

95′ 378. AC is not working. System is charged but compressor clutch will not engage. No power at compressor. It does engage if I jump it off a 12V source. I have power in and out of hi and low pressure switches. Any thing I’m missing or do I need to start looking for a broken wire somewhere?

What should I do if my air conditioner is not working?

Has no power to compressor has ground, new relay, fuse is good and also has no power to pressure switch, but has power to cycling switch. I have checked all of GM tech bulletins.

Discussion in ‘ Peterbilt Forum ‘ started by kwforage, May 9, 2017 . 95’ 378. AC is not working. System is charged but compressor clutch will not engage.

What to do if your gas compressor won’t engage?

A compressor that won’t engage can often be fixed by a home mechanic for a very small cost by checking the electric components and refrigerant level. More serious issues must be handled by a trained technician.

Is it possible to fix an air compressor?

How To Fix An Air Compressor – Any Brand, Any Problem! It’s actually not difficult to repair air compressors. They have few moving parts and are very reliable. Parts are readily available for most compressors, and with some basic air compressor motor troubleshooting, you should be able to nail down what’s wrong on your own.

What to do if there is no power to the AC compressor?

CondoCruiser, Plan-B Trucking, Cetane+ and 1 other person Thank this. put gauges on system. if there’s no freon. there’s also no voltage to the compressor. you need at least 50 lbs freon before the compressor will kick on. think, low pressure switch staying off.

What should I do if my Silverado compressor does not engage?

Hold the can of refrigerant upright and slowly open the valve on the charging hose. The pressure of your can will force the gas into your system. While the compressor may engage immediately, allow the can to empty before removing the charging hose.

What does it mean when your air conditioner compressor won’t engage?

Professional Help. A compressor that won’t engage after refrigerant charging indicates deeper problems with your air conditioning system. It could indicate faulty pressure sensors, damaged wiring or a bad HVAC control module.

What should the pressure be on the a / C compressor?

Low side must be over 28 psi and the high side must be under 350psi. If the pressures are good see if you have voltage at the compressor clutch when the compressor shuts off. If you have voltage and a good ground it could be a bad compressor coil.

Can a low pressure switch cause a compressor to go off?

Put the AC on MAX before checking the compressor. Before starting the next step of diagnosis, you should know that a low-pressure switch can create problems with the compressor clutch’s relay in some car models. The system’s computer keeps the relay grounded but it can go on and off due to the bad switch.

Why is the pulley on my AC compressor not working?

Check the front side of the clutch to examine its condition. Also, find out whether the clutch and the pulley are spinning. If only the pulley is rotating, the compressor clutch is having an issue, which could be stemming from several sources – a blown fuse, bad clutch oil, low-pressure lockout, or an open wire in the oil.

What causes an AC compressor to not engage?

If the clutch doesn’t engage, the problem could be a blown fuse, an open in the wire to the clutch coil, a bad clutch coil, a poor ground, or a low pressure lockout. AC compressor clutches receive power in a number of ways. They can activate through a relay that’s energized directly by a proper condition of the low and high pressure switches.

What should I do if my compressor clutch is not working?

If you’re not getting battery voltage, pull the compressor clutch relay and check for power and ground on the relay control coil terminals in the socket. Wiring varies by make, model, and year. Some car makers trigger the relay control coil ground through the PCM or ECM.

What happens if you run a compressor with no oil?

At that point you’re running the compressor with little to no oil. You may get it to accept a charge, but you may have already damaged the compressor before the system reaches full charge. NEVER try to bypass the low pressure switch. Doing so will force the compressor to run with inadequate oil and can destroy the compressor.

What to do if your VW compressor is not working?

VW AC COMPRESSOR FIX CHEAP! VW A/C COMPRESSOR NOT WORKING – YouTube If playback doesn’t begin shortly, try restarting your device. Videos you watch may be added to the TV’s watch history and influence TV recommendations.

Is there a bad a / C pressure switch shutting off the compressor?

Put 12 volts to the compressor and make sure the clutch locks up first. You checked the compressor clutch fuse, right? Highly unlikely the ECM died for the a/c only. Is there a bad a/c pressure switch shutting off the compressor? Get a shop to hook up the manifold gauges, jump the compressor to engage it and read the pressures.

Why is my air conditioner clutch not getting power?

Air Conditioning Compressor Clutch Not Getting Power (electrical Ok. Here it goes! No power to AC Compressor Clutch. Here are the details: After researching this I’m thinking it could be the relay in the CCRM (constant control module)? Although I can’t find a good enough diagram to find it!

Why does my AC compressor clutch not engage?

Why AC clutch won’t engage If the clutch doesn’t engage, the problem could be a blown fuse, an open in the wire to the clutch coil, a bad clutch coil, a poor ground, or a low pressure lockout. AC compressor clutches receive power in a number of ways.

How can I tell if my compressor is running or not?

Not really. DIY kits come with a low pressure side gauge and they’re designed to provide a static pressure (engine not running or AC off) and a running pressure. Static low side pressure won’t give you any idea of system charge. You could have a low side target range of 50-psi and see that static pressure on your gauge.

Has no power to compressor has ground, new relay, fuse is good and also has no power to pressure switch, but has power to cycling switch. I have checked all of GM tech bulletins.

How to turn off the air bag light?

Wait until the airbag light turns off then immediately turn the key to the off position. 2. Wait 5 Seconds 3. Repeat Steps 1 and 2 two more times 4. Turn key on and wait until the air bag light starts to flash slowly 5. Wait 10 seconds 6. Turn off the car 7. Turns it back on and the air bag light should now longer be flashing.

What’s the duty cycle on a Volkswagen a / C compressor?

3. Verify an approximate 70% duty cycle from the A/C pressure sensor at pin T14/2 (white) with the ignition on and the compressor not running (duty cycle will decrease as the high-side pressure increases).

What to do if there is no power to the air suspension pump?

If there is no power going to the air suspension compressor, check the air suspension fuse and relay. Here is a picture that shows no power to the air suspension pump. The next step would be to use a professional diagnostic scanner such as the iCarsoft MB II to check the fault codes for the Air Suspension Control Unit.

What happens when the pressure switch on an air compressor fails?

A defective air compressor’s cut-off switch can trigger a fault. When pressure switches fail, air compressors run erratically. Normally, the pressure switch prevents an air compressor from going past its cut-out (optimum) pressure. It’s an automatic sensor that protects the air compressor.

Why is my air conditioner not getting power?

We need power at he low pressure switch. Here is a guide and the wiring diagrams for the air conditioner system so we can see how it works. Check fuse 10 – 10 amp for power that is what feeds the low pressure switch and see where you are losing power. Check out the diagrams (Below).

Is the AC compressor on a Western Star working?

Discussion in ‘ Western Star Forum ‘ started by 04 LowMax, Jul 7, 2014 . Wondered if anyone has done any trouble shooting for this problem on a star? Was all prepared to head to a shop and get ac recharged, then thought I better just make sure the compressor is working. Good thing I did, it wasn’t. No 12 volts at comp plug.

Why is my a / C compressor not working on my Mercedes?

One other reason why the A/C compressor does not engage is the fact that the system may be low on R134 refrigerant. Typically older cars may have very slow leaks that may require top off with refrigerant every couple of years. You can use a R134a recharge kit to recharge your system if the A/C compressor is not working.

What kind of air conditioner does a Mercedes Benz have?

The A/C system on your Mercedes-Benz includes many sensors and components including the air conditioner compressor. The A/C compressor is the heart of the system. One crucial element of the A/C compressor is the clutch. It is important to understand how to check if the A/C compressor is engaging or not.

Which is the best a / C compressor clutch for Mercedes?

A/C PRO ACP-100 Professional Formula R-134a Ultra Synthetic Air Conditioning Refrigerant with Reusable Dispenser and Gauge – 20 oz We like the fact that this kit has a gauge for the outside temperature adjustment, so that you can now the exact pressure range you need to be on. Where to buy A/C compressor Clutch for Mercedes-Benz?

Why is my a / C CLUTCH not working on my Mercedes?

The A/C compressor clutch engages to create the high pressure in the refrigerant and it’s state is controlled by the Air Conditioner Control Unit. If there are error codes on the A/C Control Unit the compressor will not engage and you will need to reset the fault codes using a diagnostic scanner such as the Launch Creader or iCarsoft MB II.

Where are the fuse panels on a Nissan Murano?

Here you will find fuse box diagrams of Nissan Murano 2009, 2010, 2011, 2012, 2013 and 2014, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

Why is the AC not working on my Nissan Versa?

Why Isn’t My A/C Working? What are common reasons my Nissan Versa has air conditioning problems? While there are a variety of reasons your Nissan Versa air conditioning won’t work, the most common 3 are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor.

How to check / verify a / C problems Nissan club?

1. Checked the AC relay in the engine bay – going to swap it with another relay of the same type to rule that out. 2. Checked that the fan works on all 4 speeds 3.

Why is the pressure switch not getting power?

Quick recap: compressor is not getting power, pressure switch is not getting power, but the AC fuse is good. When I applied power directly from the battery to the compressor the clutch engaged. The 2006 engine has an intake sensor on top of the evaporator box.

How many volts does an AC compressor need?

The FSM (MTC-70) says that I should have 0 volts with the A/C switch on and “battery” voltage with the switch off, but I had a little over 7 volts in both cases, so I am not sure if it is “OK”, “NG-1” or “NG-2”. Any advice? This is about the most difficult troubleshooting and auto repair I have ever done.

How to know if your air conditioner compressor is not kicking on?

My Air Conditioner Compressor Is Not Kicking On. 1 Step 1. Check the power to the unit on the inside and outside of the home. Plug in the power cord for the condenser unit on the outside of the home 2 Step 2. 3 Step 3. 4 Step 4. 5 Step 5.

What to do if your air conditioner is not working?

Check the power to the unit on the inside and outside of the home. Plug in the power cord for the condenser unit on the outside of the home and inspect it for any damage. Inspect the fuse box for the unit and check for any flipped switches. Remove any broken fuses and replace them. Turn down the thermostat in the house.

What should I do if my AC compressor is not working?

While you do hear the fan, and there’s power to the unit, the compressor does not appear to be running at all. Your first course of action should be to turn down the thermostat to try to get the compressor to come on. If it doesn’t, it may have already failed due to any number of underlying problems.

What does it mean when your AC compressor does not spin?

It is an ominous sign when the clutch engages but the compressor does not spin. Changing the compressor clutch could be the only solution in this case. A bad AC compressor clutch needs immediate fixing. A delay can cause serious damage to the air conditioning system and the engine.

When do you need a new air conditioner compressor?

Because dead compressors usually happen in old air conditioners, it’s more cost-effective to start over with a new AC rather than pay to put a new compressor into a system that’s already wasting power and a few years from the junk heap. Below is helpful breakdown of the different choices you have when the compressor fails.

What to do if your Toyota Camry is not getting power to AC?

through the control module and make the compressor come on. Check your low pressure switch. Can unplug it and place jumper in wire harness. If compressor then comes on check freon pressure for proper charge if that’s ok replace switch. Would not advice running it with jumper installed other than just for testing purposes.

Is there a problem with my a / C system?

A/C ISSUES. Electrical not getting power to the compressor Hey guys, I’ve run into a problem with my A/C system and need advice. Took the car to firestone, they said that there is no system leaks, they did the dye test to confirm. They did a full evac and recharge of the freeon, everything looks good.

Why is my air conditioner running but not cooling?

It feels heavenly to have that cool air blowing straight to your face. However, sometimes your luck deprives, and you encounter that AC compressor running but not cooling. No matter how high you set that regulator, it does not seem to work.

When did the International 4300 AC wiring diagram come out?

Diagram 2010 International A C Compressor Full Version Hd Quality Diagramclothing Motoguzziercole It Diagram Wiring Ac Cobra Full Version Hd Quality Diagramthefall Roofgardenzaccardi It 2005 International 4300 Ac Wiring Diagram 12 Volt Light Switch For Schematics

When to turn on the a / C compressor in a truck?

Once the pressure is about 300 psi it will tell the engine to turn the fan on. If the a/c pressure continues to rise over about 350 the body controller will log an a/c high pressure fault which will lock out the a/c operation until the next key cycle. Does your fan come on at all?

Why is my a / C not working in my car?

It is a 2004, 4300 International. DT466, auto, air ride and brakes. The A/C compressor is ECM controlled like most modern vehicles. The computer has detected a fault in the system and will not attempt to run the a/c to prevent possible system damage. The fault you have is for an open circuit in the “thermistor”.

Why does my air conditioner pressure not change?

If your expansion valve was stuck in the open position then you may not see much, if any, change in pressures. Before replacing the expansion valve I would recommend you remove the compressor inlet line and turn the compressor by hand to see if you feel it sucking in the line you disconnected.

How to know if your air conditioner compressor is bad?

Before replacing the expansion valve I would recommend you remove the compressor inlet line and turn the compressor by hand to see if you feel it sucking in the line you disconnected. If you do not feel any suction then you have a compressor that is bad.

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