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The machine is low and needs recharging if the high and low side pressure indicators look reduced. But before any toaster is added, check where the refrigerant will be going, to find out. AIR CONDITIONING PROBLEM: REFRIGERANT LEAKS All vehicles leak through microscopic and some past seals pores in hoses.



Newer vehicles have seals that are better and barrier style hoses typically leak under a couple tenths of an ounce of refrigerant per year. But system capabilities also tend to be smaller on newer vehicles, so any reduction of refrigerant will have more of a negative impact on performance.

The telltale oil stains and wet stains that suggest flows on older R-12 systems are not as noticeable on the newer R-134a systems since PAG lubricants are not as"oily" as mineral oil. This makes it harder to see leaks. Leaks are located with the addition of special dye to the machine (accessible pressurized cans caked with refrigerant), an electronic leak detector, or plain old stale water (spray on hose connections and watch for bubbles -- requires adding some equipment to system initially and turning off the A/C onto ).

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Leak repairs require replacing O-rings, hoses or seals. But if the evaporator or condenser are currently leaking, repairs can be expensive. Linking a judge set to the pressure support fitting on the computer system best does POOR COOLING PERFORMANCE. Though inferior cooling is often due to a minimal cost of refrigerant, it can also be caused by a number of different variables (see graph above).

Within an 80 degree day, the very low judge ought to read about 56 psi or higher if the A/C machine comprises a decent charge of refrigerant. On a 90 degree day, the LOW side studying ought to be higher or about 70 psi. Some extra refrigerant is likely needed by the A/C system if the LOW gauge reading is much less than this.

Most newer passenger automobile A/C systems do not hold much refrigerant (14 to 28 ounce ) , and therefore you don't want to add too much when the system is how car heaters work low. AIR CONDITIONER PROBLEM: INTERMITTENT COOLING An A/C system which blows cold air for awhile then warm atmosphere is probably freezing up. This is sometimes brought on by air and moisture in the system which enables ice prevent and to form the tube.

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, an A/C system must contain less than 2% air for best operation. For each 1% increase in the sum of air that displaces refrigerant from the system, there will be a corresponding fall of about a degree in cooling performance.

Air can get within a system through flows, by not devoting the machine before recharging it, or by massaging the system with refrigerant that is contaminated with atmosphere. Recovery equipment can suck air to the tank if an A/C machine comprises air or if the machine has a flow.

On some gear, this is done automatically. However, on gear that lacks an a/c pro.com automated purge cycle, tank temperature and pressure has to be measured and compared to a static strain benchmark graph. Air can be detected by some refrigerant identifier equipment . An identifier should be used to inspect the refrigerant until the system is serviced to stop cross-contamination of recycling and recovery equipment.

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This switch prevents the compressor from running if the refrigerant level is low. In the event the cutout switch is not reading correctly, the compressor can be prevented by it from coming on. Faulty compressor clutch. Entire battery voltage is required by the clutch on the compressor. If the voltage into the clutch is low, or even so the clutch coils have too much resistance, or the air gap at the clutch is really great, the clutch might not participate to drive the compressor.

Check to find out if voltage is being received by the relay once the A/C is turned on. Assess ground links and the wiring. The relay is probably bad if bypassing the relay or navigation battery voltage directly makes the A/C work. Faulty A/C controller switch.

Some possible causes of irregular cooling (or some heating ) on automatic A/C techniques include all the above, plus:A problem from the management module or controller head (this usually requires using a dealer scan tool to read error codes and execute self-diagnostics). A poor temperature sensor (a ambient air temperature sensor, inside air temperature sensor, evaporator temperature sensor, or sunload detector ).

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AIR CONDITIONING PROBLEM: NOISE Noise in the compressor usually means the compressor is on its way outside. But noise may also be caused by cross-contaminated refrigerant (working pressure too large ), home depot culebra air from the machine or the wrong sort of compressor lubricant. Noise may also be due to hoses or components rattling against other components in the motor compartment.