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The system is low and needs recharging if the low and high side pressure indicators look reduced. However before any toaster is added, check for leaks in which the refrigerant will be moving to find out.

Newer vehicles have seals and barrier style hoses so leak less than a few tenths of an ounce of refrigerant per year. But so any loss of refrigerant may have more of an adverse effect on performance that is cooling system capacities also tend to be smaller on vehicles.

The telltale oil stains and wet spots that indicate leaks on elderly R-12 systems are not as noticeable on the more recent R-134a systems since PAG lubricants aren't as"oily" as mineral oil. This makes it more challenging to observe escapes. Leaks can be discovered with the addition of special dye into the machine (accessible pressurized cans caked with refrigerant), an electronic leak detector, or plain old sterile water (spray on hose connections and watch for bubbles -- requires adding some refrigerant to system initially and turning off the A/C onto ).

Most flow repairs involve replacing seals, O-rings or hoses. But if the evaporator or condenser are leaking, repairs may be costly. POOR COOLING PERFORMANCE is achieved by connecting a gauge set to the low and high pressure support matching on the system. Though bad cooling is often because of a minimal cost of refrigerant, it can also be caused by a number of other variables (see chart above).

Within an 80 degree day, the very low judge ought to read about 56 psi or higher if the A/C machine comprises an adequate control of refrigerant. On a 90 degree afternoon, the side studying ought to be approximately 70 psi or higher. When the estimate reading is less than that, some extra refrigerant is probably needed by the A/C system.

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Most newer passenger car A/C systems don't consume much refrigerant (14 to 28 oz.) You don't want to include too much if the system is low. AIR CONDITIONER PROBLEM: INTERMITTENT COOLING An A/C system that blows cold air for awhile then warm air is probably freezing up. This can be brought about by air and moisture in the system that enables ice block and to form the orifice tube.

Evacuation should be accomplished with a vacuum pump that's capable of achieving and carrying a high vacuum (29 inches) for 30 to 45 minutes. By weight, an A/C system must comprise less than 2% atmosphere for best operation. For every 1 percent increase in the total quantity of atmosphere that displaces refrigerant in 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 evacuating the system before recharging it, and/or by recharging the system with refrigerant that is contaminated with atmosphere. Recovery gear can suck air if the system has a leak or if an A/C machine includes air.

On some equipment, this can be done automatically. But on gear that lacks an automatic purge cycle, tank temperature and pressure has to be measured and compared to a static strain benchmark chart. Some refrigerant identifier gear can detect air . An identifier should be utilized to confirm the refrigerant before the machine is serviced to reduce cross-contamination of recycling and recovery equipment.

This change prevents the compressor from running when the refrigerant level is low. In the event the cutout switch isn't reading properly, it may prevent the compressor. Faulty compressor clutch. Battery voltage is required by the clutch on the compressor. In case the voltage to the clutch is reduced, or the clutch coils have an excessive amount of resistance, or the air gap at the clutch is really great, the clutch may not engage to push the compressor.

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Check to see if voltage is being received by next page the relay when the A/C is turned on. Assess the relay wiring and ground links. The relay is most likely bad if bypassing the cable or routing battery voltage directly makes the A/C function. Faulty A/C control switch.

Some possible causes of intermittent cooling (or some other cooling) on automatic A/C techniques incorporate all of the above, plus:A problem from the management module or controller mind (this generally requires using a trader scan tool to read error codes and execute self-diagnostics). A poor temperature detector (an ambient air temperature sensor, interior air temperature detector, evaporator temperature detector, or sunload detector ).

AIR CONDITIONING special info PROBLEM: NOISE Noise from the compressor means that the compressor is on its way outside. But noise click now can also be caused by cross-contaminated refrigerant (working pressure too high), air in the machine or the incorrect kind of compressor lubricant. Noise may be caused by hoses or parts discriminated against other parts in the engine compartment.