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The machine is low and needs recharging if the high and low pressure indicators look reduced. But before any refrigerant is added, check where the refrigerant will be going to discover.

Newer vehicles have better seals and barrier style hoses so typically leak less than a couple tenths of an ounce of refrigerant per year. But system capabilities also tend to be smaller on newer vehicles, therefore any reduction of refrigerant will have more of an adverse effect on performance.

The telltale oil spots and wet stains that indicate leaks on older R-12 systems are less apparent on the newer R-134a systems because PAG lubricants are not as"oily" as mineral oil. This makes it more difficult to see escapes. Leaks can be located with the addition of special dye into the machine (available in pressurized cans premixed with refrigerant), an electronic leak detector, or plain old soapy water (spray on hose links and await bubbles -- necessitates adding some refrigerant to procedure initially and turning off the A/C onto ).

Leak fixes involve replacing hoses, seals or O-rings. But if the evaporator or condenser are leaking, repairs can be costly. POOR COOLING PERFORMANCE is done by linking a judge set to the high and low pressure support matching on the system. Though poor cooling is frequently due to a very low cost of refrigerant, it can also be brought on by many different factors (see graph above).

On an 80 degree day, the very low gauge should read about 56 psi or greater if the A/C machine includes an adequate charge of refrigerant. On a 90 degree day, the LOW side studying should be greater or about 70 psi. If the estimate reading is much less than that, some extra refrigerant is likely needed by the A/C system.

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The majority of newer passenger automobile A/C systems don't hold much refrigerant (14 to 28 ounce ) You don't need to add. AIR CONDITIONER PROBLEM: INTERMITTENT COOLING An A/C system that blows cold air for awhile then warm air is probably freezing up. This is sometimes brought on by air and moisture in the system that enables ice prevent and to form the tube.

For best operation, an A/C system should comprise less than 2% air by weight. For each 1 percent increase in the quantity of air that displaces refrigerant from the system, there will be a corresponding fall of about one degree in cooling performance.



Air can get inside a system through flows, by not devoting the system before recharging it, and/or by recharging the system with refrigerant that is contaminated with atmosphere. Recovery gear can suck air into the tank if air is contained by an A/C system or when the system has a leak.

On some equipment, this can be done mechanically. However, on gear that lacks an automated purge cycle, tank pressure and temperature needs to be measured and compared to some static strain reference chart. Air can be detected by some identifier gear in the machine as well as some other contaminants. An identifier should be used to look at the refrigerant until the machine is serviced to prevent cross-contamination of recycling and recovery equipment.

This change prevents the compressor from working if the refrigerant level is low. The compressor can be prevented by it from check that arriving on, if the cutout switch isn't reading correctly. Compressor clutch. The clutch on the compressor demands battery voltage. In case the voltage to the clutch review is reduced, or even so the clutch coils have an excessive amount of resistance, or the air gap at the clutch is really good, the clutch may not participate to push the compressor.

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Check to determine whether the relay is receiving voltage once the A/C is switched on. Assess ground relations and the relay wiring. The relay is most likely bad When bypassing the relay using a jumper cable or routing battery voltage directly makes the A/C work. Faulty A/C control switch.

Some possible causes of irregular cooling (or some heating ) on automatic A/C systems incorporate each of the above, also:A difficulty from the control module or control head (this usually requires using a dealer scan tool to read fault codes and execute self-diagnostics). A bad temperature detector (an ambient air temperature sensor, interior air temperature detector, evaporator temperature sensor, or sunload sensor).

But noise Get the facts can also be brought on by cross-contaminated refrigerant (working pressure too large ), air in the system or the incorrect type of compressor lubricant. Noise may be due to hoses or other components discriminated against other components in the engine compartment.