Always follow the vehicle or lubricant manufacturers compressor oil recommendations. Sludge is usually the result of moisture-contamination. NOTE: High and Low side pressure readings will vary with ambient temperature and humidity. This should be done when retrofitting an R-12 system to R-134a. Source
But before any refrigerant is added, check for leaks to find out where the refrigerant is going. Newer vehicles have better seals and barrier style hoses so typically leak less than a few tenths of an ounce of refrigerant a year. This can be caused by air and moisture in the system that allows ice to form and block the orifice tube. Click the Banner Below to Ask an Expert: More Air Conditioning Articles: Air Conditioning Inspection Checklist Troubleshoot Automatic Climate Control System A/C Cooling Problem: Blows Warm Air Only No Cool Air website here
Connect the Low Pressure Hose (the one with the smaller coupling) to the Low Side Service port (usually located on the accumulator, or on the suction hose that goes from the Need Help Now? These include "parallel" flow condensers and those with extremely small passageways. Again, a factory scan tool is usually required to perform diagnostics on the system.
The Harrison DA6 can be replaced with a HD-6, HR-6 or HR-6HE compressor. If the compressors magnetic clutch is not engaging when the A/C is turned on, the problem may be a blown fuse or a wiring problem. R134A RETROFIT As long as R-12 is available, there is no real reason to convert older vehicles to R-134a. Car Ac Not Blowing Cold Air Sometimes The Ford FX-15 compressor can be replaced with a FS-10 compressor.
Replace the motor that controls the blend air door (this is a difficult job and best left to a professional since it involves tearing apart the HVAC unit -- about an Car Ac Not Cooling In Hot Weather R-12 systems require mineral oil while R-134a systems require various types of PAG oil or POE oil. A blockage here will prevent the refrigerant from entering the evaporator or recirculating through the refrigeration circuit. Some possible causes of intermittent cooling (or no cooling) on automatic A/C systems include all of the above, plus: A problem in the control module or control head (this usually requires
The magnetic clutch on the compressor requires full battery voltage to engage. Car Air Conditioner Not Blowing Cold Air When Idling So you should also replace the accumulator or receiver-drier if the system is contaminated, has leaks or must be opened up for repairs. If the debris is carried through the condenser and enters the liquid line, it can plug the orifice tube or expansion valve. For best performance, an A/C system should contain less than 2% air by weight.
Once you've found a leak, repairs should be made prior to fully recharging the system. http://blog.firestonecompleteautocare.com/maintenance/car-air-conditioning-repair-troubleshooting/ If the reading is lower, the system may be low on refrigerant. Car Ac Not Cold Enough It should also be done if the lubricating oil is contaminated or the system contains the wrong type of oil for the application. Car Air Conditioner Troubleshooting Flushing out the old oil can prevent oil overcharging, reduced cooling performance and/or lubrication incompatibility problems.
This applies to the Harrison DA6 and Ford FX-15 compressors. this contact form If so, the compressor is working and the A/C system probably contains enough refrigerant to make cold air, so the problem is inside the HVAC unit. On an 80 degree day, the LOW gauge should read about 56 psi or higher if the A/C system contains an adequate charge of refrigerant. More than 6% air can cause a very noticeable drop in cooling performance, and possibly cause evaporator freeze-up. Car Ac Not Blowing Cold Air After Recharge
Compressor failures are usually the result of loss of lubrication, which in turn may be due to low refrigerant in the system, a blockage (such as a plugged orifice tube which Replacing badly contaminated parts such as the condenser, accumulator or receiver-drier and orifice tube or expansion valve is another way to get rid of these contaminants, but flushing is usually a The switch may be worn and not making good contact when it is turned on. have a peek here Start the engine, turn on the A/C to MAX, and rev the engine to 2000 RPM.
Most newer passenger car A/C systems do not hold much refrigerant (14 to 28 oz.), so you don't want to add too much if the system is low. Car Ac Blowing Hot Air After Recharge Share Got an Air Conditioning Problem or Question? After the air is out, it can be recharged with the specified amount of refrigerant.
For more information, see the R134A RETROFIT GUIDE program featured on this website. A/C FLUSHING If the compressor has failed, or the system is full of sludge or contamination, the condenser, evaporator and hoses should all be flushed with an approved flushing chemical (such For this reason, the refrigerant recovery tank on recycling equipment must be checked and purged daily. Car Air Conditioner Repair Cost Because R-134a raises compressor discharge pressures and increases the compressors work load, some lightweight compressors may not be rugged enough to tolerate R-134a over the long haul.
Noise can also be caused by hoses or other parts rattling against other components in the engine compartment. Air can get inside a system through leaks, by not evacuating the system prior to recharging it, and/or by recharging the system with refrigerant that is contaminated with air. If both the high and low side pressure gauges read low, the system is low and needs recharging. Check This Out But on equipment that lacks an automatic purge cycle, tank pressure and temperature has to be measured and compared to a static pressure reference chart.
It is important to get any air out as this will reduce cooling efficiency and may make the compressor noisy. Using mineral oil in a newer R-134a system can cause serious lubrication problems as can using the wrong grade (viscosity) of PAG oil. The next thing you should check when troubleshooting a no cooling problem is system pressure. If the orifice tube is plugged, the high side pressure reading will be lower than normal, and the low side reading will also be lower than normal because no refrigerant is
Most of this debris collects in the condenser where it can cause blockages that reduce cooling performance. If the compressor works when you jump it, and the A/C blows cold air, the system contains refrigerant and the fault is likely a bad A/C compressor clutch relay or a The Gauge Set must be connected to the A/C service ports on vehicle to read the pressures while the system is running. If the cutout switch is not reading correctly, it can prevent the compressor from coming on.
No Cooling from Your A/C/? Tiny flakes of rubber can be carried along to the orifice tube or expansion valve and cause a blockage. Recovery equipment can suck air into the recycling tank if an A/C system contains air or if the system has a leak. For added insurance after flushing, you can install a high side filter to protect the orifice tube or expansion valve from any residual debris that might still be in the system,
This includes original equipment compressors such as Tecumseh HR980, some Keihin compressors and some Panasonic rotary valve style compressors in older Nissan vehicles. Besides smelling bad, it can be unhealthy to breathe (ever hear of Legionnaires Disease?). A High side pressure reading of less than 150 PSI indicates a low charge or a compressor problem.