Solved: car ac testing

Thursday, November 24, 2011

How to test Cars AC System?

If you need dis-assembly or replacement instructions for any other auto/car part, or you want to ask question related to your car/truck jeep problem then please leave the comment with your details, so I can provide you the required instructions and solutions.

Car AC system Testing is as follows :----

WARNING

Never expose A/C refrigerant to open flame. A poisonous gas, phosgene or mustard gas, will result.

A/C Sytem Test

Testing Air Conditioning Efficiency

Before temperature and pressure tests, the following list of items should be met:

Set the temperature control to maximum cool and normal AC. Some manufacturers call for MAX AC so that recirculating air is used. Be sure to check the specifications.
Set the blower position to high.
The temperature inside of the car must be stabilized (not getting cooler).
Engine speed must be at least 1500 rpm to ensure adequate refrigerant flow.
The compressor clutch must be engaged.

Air Discharge Temperatures

This chart below shows a chart of expected air discharge temperatures at different outside temperatures. The vertical temperature readings refer to actual duct readings. The horizontal readings refer to the day's outside temperature.

A chart showing expected air discharge temperatures at different outside temperatures. Courtesy of Ford Motor Company.

The drop in the air's temperature as it passes through the evaporator should be at least 20°F. It is very difficult to tell how well A/C works on a cool day.

Rules of thumb:

With 70°F air entering the evaporator, expect about a 20°F drop in air temperature (50°F).
With 80°F air entering the evaporator, expect about a 25°F drop in air temperature (55°F).
With 90°F air entering the evaporator, expect about a 30°F drop in air temperature (60°F).

It is important that the hood be closed during this test.

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There are tests like :---

AC pressure test.

Leak detection test.

To know more about this test and perform this test yourself.Check the link details shown below:----

How to Perform AC Pressure Test?

http://repairhelpcenter.blogspot.com/2011/11/how-to-perform-ac-pressure-test.html

How to Perform Car AC Leak detection Test?

http://repairhelpcenter.blogspot.com/2011/11/how-to-perform-car-ac-leak-detection.html

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For Additional Help regarding CAR/Truck AC Problems:---

How to inspect Vehicles A/C Compressor and Clutch?

http://repairhelpcenter.blogspot.com/2011/11/how-to-inspect-vehicles-ac-compressor.html

How to Troubleshoot Vehicles AC Cooling Problem?

http://repairhelpcenter.blogspot.com/2011/11/how-to-troubleshoot-vehicles-ac-cooling.html

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For car AC related and Heater related solutions. You can refer the options mentioned below:---

For details regarding:--

How does Vehicles Engine cooling system works?

http://repairhelpcenter.blogspot.com/2011/11/how-does-vehicles-engine-cooling-system.html

Engine cooling components working?

http://repairhelpcenter.blogspot.com/2011/11/engine-cooling-components-working.html

How to flush cars radiator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-flush-cars-radiator.html

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How to Perform Car AC Leak detection Test?

The procedure for AC leak detection test is as follows :-------

Leak Detection

Leaks can be found using several means. These include soapy water, internal dyes, and several types of special leak detectors.

Soapy water is made by mixing water and soap to a thick solution that can be applied with a small brush. If the leak is large enough, soap bubbles will appear.

Soap bubbles showing a leak in a hose. Courtesy of Best Educational Trainers, Inc.

An internal charge detection method includes injecting a coloring agent into the low side of the system. Some red dyes are available in pound-size refrigerant containers. The dye is harmless and will be left in the system after the test. If dye leaks out, it will be visible at the source of the leak. A problem with the red dyes is that they can leak onto interior carpet and cause a damaging stain. If there is a leak, the dyed refrigerant will have to be recovered for reuse.

Another dye method uses fluorescent dye. A black light is used to locate the leak.

A fluorescent dye is added to the system before checking for leaks with a black light. Courtesy of Tracer Products, Westbury, NY.

This method is very effective on difficult leaks that only happen during the vibration that results from driving the vehicle. The dye will pinpoint where it leaked. The system is charged to at least 10% capacity for either test. This is so the system can develop normal operating pressure. There should be at least 50 psi static pressure (when the engine is off).

Electronic leak detectors are the most popular ones used today. Many of them work on both R-12 and R-134A refrigerants.

An electronic leak detector that works on both R-12 and R-134A refrigerants.

The tester nozzle is moved around the various joints in the system. The probe is held at a distance within 1/4" of the joint being checked. When a leak is found, the tester lights up and its slowly pulsing, high-pitched horn or clicking sound becomes more rapid. The tester has a sensitivity adjustment. You can adjust it so that it just stops ticking. When it starts to tick you have found a leak. The "gross leak" position can find leaks of 4 ounces per year. The sensitivity in this position is less so you can locate the exact source of the leak.

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This details will help.

Thanks.

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