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?

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.

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 air conditioning not working on my Mercedes S500?

What are common reasons my Mercedes-Benz S500 has air conditioning problems? While there are a variety of reasons your Mercedes-Benz S500 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.

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.

Why is my a / C not working on my Chevy Silverado?

Subject: Air Conditioning (A/C) Blows Warm Air Intermittently. This condition may be caused by the A/C compressor clutch cycling out early when the low pressure side reaches approximately 380 kPa (55 psi). The fix is to bring the vehicle to the dealer to have the latest software installed into the vehicle.

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 does the a / C compressor clutch not engage even?

The a/c compressor clutch will not engage even when I jump the low pressure switch thats mounted on the top of the accumulator (dryer). Is there another method such as direct from the battery? There are two wires goin into the compressor instead of one so I am unsure of how.

Why does high side pressure not change when compressor is running?

Basic summary is that the low side pressure drops, but the high side pressure doesn’t change when the compressor is running, so I suspect blockage upstream of the compressor. Okay – got all the stuff, so I guess we’ll see how it goes. I’m not an AC guy, please let us know how it goes.

What should the pressure be on an air conditioner compressor?

An air conditioner or heat pump using R-410A refrigerant may operate at pressures exceeding 600 psi. A typical Carrier HVACR unit incorporates a high-pressure safety switch that operates at 610 psi and a low pressure (loss of refrigerant detection safety device) that operates at about 20 psi.

Can a broken valve cause a compressor not to work?

If the compressors works after a new start relay is installed, the problem will be resolved and you should be all set. Valves – A broken valve can create major problems in a compressor. The most common issue is that the refrigerant is liquid instead of gas when it gets to the compressor inlet.

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.

Where is the power to the AC compressor?

No power to AC compressor. Power is at switch on dashboard, but can’t trace power past switch. What wires from switch take power to the compressor. Pressure switches appear to be closed.

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.

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

High pressure sensor could be a likely culprit. The body controller will monitor the a/c system pressure through the high pressure sensor. Once the pressure is about 300 psi it will tell the engine to turn the fan on.

Is there a fuse for the AC compressor?

Yes, fuse and relay are fine. I think that year model may have a thermostat around the evaporator. You need to make sure you have power to both sides of that when you have the A/C switched on. wore out, bigguns and baha Thank this.

Where is the AC compressor on a truck?

One usually on driver side around the top of radiator. One on driver side on lines near fan solenoid. And one on passenger side on lines on cab. One is low pressure, one is high pressure, and one is fan control. I can’t remember which is which without looking. Wore out is right about if power is at the switches then probably harness.

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.

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.

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.

Why does my Kenworth Truck have no a / C?

If they are plugged with dirt, leaves and bugs..then you won’t get proper air flow throw them and no A/C, with out the truck moving and the fan engaged…been there…paid for that!! The condensor needs to be pulled off the front, washed and blowen out from the back..you cannot wash or blow the dirt through towards the radiator !!

How to stop a / C clutch running in Kenworth?

Turn off AC, wait a few min to let sides balance out or it will likely go off on high head pressure if compressor is engaged with out allowing time,there is a high head pressure switch to prevent this.

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 international 4300 DT 466 AC not working?

Im working on another ac, 2005 international 4300 dt 466 we replaced 3 major ac hoses, orfice tube, high pressure sensor and recharged the system as international specs. Well we started the system and is not blowing cold air, is 85f inside cab. Did we missed anything

What does a Freightliner air conditioner compressor sound like?

Freightliners use a simple dial on the HVAC control unit to control the setting of the AC system. On a freightliner, the sound of the compressor starting is unmistakable. You should hear a low “hum” followed immediately by the cooling fan turning on.

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