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If the low and high side pressure gauges read reduced, the machine is reduced and requires recharging. However before any refrigerant is included, check in which the refrigerant is going, to discover. AIR CONDITIONING PROBLEM: REFRIGERANT LEAKS All vehicles flow microscopic and some refrigerant seals pores .

Newer vehicles have seals that are greater and barrier style hoses so leak less than a couple tenths of an ounce of refrigerant a year. But system capacities tend to be smaller on newer vehicles, so any loss of refrigerant may have more of an effect on performance.

The telltale oil stains and wet stains that suggest flows on older R-12 systems are much less apparent on the more recent R-134a systems because PAG lubricants are not as"oily" as mineral oil. This makes it harder to find leaks. Leaks are seen by adding special dye into the machine (available in pressurized cans caked with refrigerant), an electronic leak detector, or plain old stale water (spray hose links and watch for bubbles -- requires adding some refrigerant to system first and turning off the A/C on).

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Most flow fixes require replacing seals, O-rings or hoses. But if the evaporator or condenser are leaking, repairs can be expensive. POOR COOLING PERFORMANCE is done by linking a judge set to the low and high pressure service fitting on the computer system. Though poor cooling is often due to a minimal cost of refrigerant, it can also be caused by many other factors (see graph above).

On an 80 degree day, the very low gauge should read about 56 psi or greater if the A/C system includes an adequate control of refrigerant. On a 90 degree day, the LOW negative reading should be about 70 psi or greater. If the judge reading is less than that, the A/C system likely requires some refrigerant.

Most newer passenger automobile A/C systems don't hold much refrigerant (14 to 28 ounce ) You don't need to add too much when the machine is low. This is sometimes brought about by air and moisture from the system that enables ice to form and prevent the tube.

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Evacuation should be done with a vacuum pump that is capable of attaining and holding a high vacuum (29 inches) for 30 to 45 minutes. For the best operation, an A/C system ought to contain less than 2 percent atmosphere . For each 1% increase in the quantity of atmosphere that displaces refrigerant in the system, there'll be a corresponding fall of about a level in cooling system performance.

Air can get in a system through flows, by not distributing the machine before recharging it, and/or by recharging the system with refrigerant that is contaminated with air. Recovery gear can suck air if the system has a flow or if an A/C system includes air.

On some gear, this is done automatically. However, on equipment that lacks an automatic purge cycle, tank temperature and pressure has to be measured and compared to a static strain benchmark chart. Air can be detected by some identifier gear . An identifier ought to be utilized to look at the refrigerant before the machine is serviced to reduce cross-contamination of recovery and recycling equipment.

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This change prevents the compressor from working if the refrigerant level is reduced. In the event the cutout switch is not reading properly, it can prevent the compressor. Compressor clutch. The clutch on the compressor requires battery voltage. If the voltage into the clutch is reduced, or even so the clutch coils see here now have an excessive amount of resistance, or the air gap at the clutch is really great, the clutch might not engage to drive the compressor.

Once the A/C is turned on check to see if voltage is being received by the relay. Check ground links and the wiring. When bypassing the relay using a jumper wire or Extra resources routing battery voltage directly gets the A/C workthe relay is bad. Faulty A/C control switch.

Some probable causes of irregular cooling (or even any heating ) on automatic A/C techniques incorporate all of the above, plus:A problem from the control module or control head (this generally check that involves using a trader scan tool to read error codes and perform self-diagnostics). A terrible temperature detector (an ambient air temperature sensor, interior air temperature sensor, evaporator temperature detector, or sunload detector ).

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AIR CONDITIONING PROBLEM: NOISE Noise from the compressor means the compressor is on its way out. But sound can also be caused by cross-contaminated refrigerant (operating pressure too large ), air from the system or the incorrect sort of compressor lubricant. Noise may be due to hoses or components discriminated against other components in the motor compartment.