Will a Ac Pressure Gague Read Corectly if Compressor Is Not Working

There is never a practiced time for your air conditioning in your auto to stop working, merely it typically seems to happen in the dead estrus of summer. If your Air-conditioning organisation has either quit working or has stopped working well, you're faced with driving your vehicle around with the windows down - which brings little relief when it is hot exterior. Having some cognition about how the air-conditioning works in your vehicle can help you lot get the arrangement functioning over again.

Function 1 of ix: Understanding the Air-conditioning arrangement and components

Your car's air conditioning system works just like a refrigerator or your abode air conditioning. The purpose of the system is to remove hot air from the inside of your vehicle. It consists of the post-obit components:

Component 1: Compressor. The purpose of the compressor is to pressurize the air conditioning system and circulate the refrigerant. It's located at the front of the engine and is typically driven by the master drive belt.

Component 2: Condenser. The condenser is located in the forepart of the radiator and is used to remove oestrus from the refrigerant.

Component 3: Evaporator. The evaporator is located inside the nuance of the vehicle and is used to absorb rut from the interior of the car.

Component iv: Metering device. This is known every bit a metering tube or an expansion valve and tin can exist located either under the nuance or under the hood near the fire wall. Its purpose is to change the pressure in the air conditioning system from high pressure level to low force per unit area.

Component 5: Hoses or lines. These consist of metal and rubber lines to carry the refrigerant.

Component 6: Refrigerant. Typically, all systems today comprise R-134A refrigerant. This can exist purchased over the counter at about car parts stores. Older vehicles were built with R-12, which is no longer used because information technology contained high amounts of ozone depleting compounds. If you lot take a license and certification you can still purchase this, though most people opt to retrofit this system to the newer R-134A refrigerant.

Though these are the master components of the air conditioning system, your vehicle has a series of electrical circuits that let it to function, as well as a dash system that contains numerous doors that motion within the nuance that can affect effectiveness. Below are the near common causes of poor air-conditioning performance and what can exist done to go you comfortably dorsum on the route.

When performing whatsoever air conditioning system service you must accept the proper tools - and exercise caution when using them.

Reason i: High force per unit area. The air conditioning arrangement is filled with loftier pressure refrigerant, and tin operate at over 200 psi, which can be very dangerous.

Reason ii: High temperature. Parts of the Ac system tin reach well over 150 degrees Fahrenheit so be very conscientious when coming in contact with parts of the system.

Reason 3: Moving parts. Yous must lookout man out for moving parts under the hood while the engine is running. Keep all articles of clothing tightly secured.

Materials Needed

• Ac manifold gauge set
• Gloves
• Refrigerant
• Safety Glasses

• Cycle Chocks

• Alarm: Never add anything but the recommended refrigerant to the Ac organization.

• Warning: Always vesture prophylactic glasses when servicing any pressurized arrangement.

• Warning: Never install the gauges with the organisation running.

Part 3 of 9: Performance check

Step i: Park your vehicle on a level surface.

Step 2: Place the bike chocks around the driver side rear tire.

Pace iii: Open the hood.

Step 4: Locate the air-conditioning compressor.

• Tip: The compressor will be mounted towards the front of the engine and is driven by the engine bulldoze chugalug. You may need a flashlight to be able to meet it. Information technology's 1 of the larger pulleys in the organization and has a separate clutch located on the front of the compressor. It volition also have two lines connected to it. If yous take problem locating information technology then beginning your engine and turn the air workout off. The compressor pulley will exist spinning with the chugalug, but you should observe that the front of the compressor clutch is stationary.
  

Pace five: Turn on the AC. Turn the air workout on in the vehicle and run into if that clutch that was previously stationary is now engaged.

Step 6: Turn the fan to Medium. If the compressor clutch engaged, return to the inside of your vehicle and turn the fan speed to Medium.

Step vii: Cheque the air temperature. Run into if the temperature of the air coming from the main dash vents is cold.

Read the parts below to understand the different weather that you may see:

• No air coming out of the vents
• The compressor clutch not engaging
• The clutch is engaging merely the air not cold
• The system is empty on refrigerant
• The organisation is low on refrigerant

Part 4 of nine: No air comes out of the nuance vents

When performing your initial check, if air does not come from the center dash vents or if the air is coming from the wrong vents (such as the floor or windshield vents) then you have a problem with the interior climate control arrangement.

• Airflow issues can be caused past annihilation from a blower motor problem to an electrical issue or a module failure. This would need to be diagnosed separately.

Part 5 of nine: The compressor clutch does not engage

The clutch may not engage for several reasons, the virtually common being low refrigerant in the system, but it may likewise be an electrical issue.

Reason 1: Voltage. Voltage is non sent to the clutch when the air conditioning is turned on due to an open excursion in the electrical excursion.

Reason 2: Pressure switch. An ac system pressure switch tin can disrupt the circuit if certain pressures are non met or if the switch is failing.

Reason 3: Input effect. More upwardly to date systems are estimator controlled and use numerous other inputs including vehicle interior and exterior temperature to determine whether or not to plough the compressor on.

You need to determine if there is refrigerant in the system.

Step 1: Turn the engine off.

Step 2: Install the gauges. Install the gauge prepare by locating the loftier and low side quick connections.

• Tip: The location of these vary on every motorcar, merely about of the time you will find the low side on the passenger side of the engine compartment and the high side towards the front. The size of the fittings are different so yous will not be able to install the gauge set backwards.
  

Step 3: Observe the pressure readings on the gauges.

• Warning: Do not check for pressure past pressing on the fitting to encounter if refrigerant comes out. This is unsafe and it is illegal to vent refrigerant into the atmosphere.

• If the reading is zero you have a major leak.

• If there is pressure but the reading is below 50 psi then the organisation is depression and may just demand to be recharged.

• If the reading is above 50 psi and the compressor is not engaging then there is either a problem with the compressor or yous accept an electrical system failure that needs to be diagnosed.

Part 6 of 9: The clutch engages simply the air is non cold

Step one: Plow the engine off and install the gauge set.

Step 2: Restart the engine and turn on the air conditioning.

Step 3: Observe the force per unit area readings.

• Though every ac system volition vary, you want to see the high side pressure level around 20 psi and the depression side around 40 psi.

• If both the loftier and the low side are below these readings and then y'all may demand to add together refrigerant.

• If the readings are very high then you lot may accept a trouble with air trapped in the system or an airflow problem with the condenser.

• If the pressures do non change at all when the compressor engages then the compressor has failed or there is a trouble with the metering device.

Part seven of nine: The system is empty

Materials Needed

• Refrigerant dye

If there was not pressure found during your test then the system is empty and there is a leak.

• Most air conditioning system leaks are modest and difficult to find.

• The most effective way to locate a leak is with refrigerant dye. Dye kits are sold at most auto parts stores.

• Using the manufacturer'due south instructions, inject the dye into the air-conditioning system. This is usually done through the depression pressure service port.

• Permit the dye to works its mode through the system.

• Using the supplied UV lite and spectacles you will inspect all of the components and hoses of the air conditioning system and look for any glowing fabric.

• Most dyes are either orange or yellow.

• Once you lot discover the leak repair it as needed.

• If the organisation was empty then it will need to be fully evacuated and recharged.

Part 8 of 9: The system is low

• When adding refrigerant to the system yous want to take it slow as you do not know how much it actually needs.

• When a shop performs this duty, they apply a machine that pulls the refrigerant from the organization, weighs it, and and so allows the technician to add the exact corporeality of refrigerant dorsum into the organization.

• Most store-bought refrigerant kits come up with their own charging hose and gauge that allow you lot to add refrigerant yourself.

Footstep 1: Plough off the engine.

Step ii: Disconnect depression side judge. Disconnect the approximate set up from the low side port.

• Tip: You must only charge on the depression side to forestall injury.

Step three: Install charge kit. Install the charging kit to the low side connection on the Air-conditioning organization.

Footstep 4: Turn on engine. Turn on the engine and the air conditioning.

Stride 5: Detect. Find the gauge on the kit and begin calculation the refrigerant whether it be with a button or a trigger on the kit.

• Tip: Add the refrigerant in small amounts, checking the recharge gauge betwixt applications.

Footstep 6: Achieve desired force per unit area. Terminate adding when the approximate is steadily in the light-green area, which is usually between 35-45 psi. Allow the system to continue running and check the temperature of the air coming out of the dash vents making sure it is cold.

Step 7: Disconnect the charging hose.

You have now filled the system with refrigerant. Make sure that y'all do not overcharge the arrangement as also much refrigerant is just equally bad - if not worse - than too fiddling.

Part 9 of 9: The air conditioning withal does not work

• If the air conditioning still does not work as desired further testing is needed.

• Warning: You lot must have a special license to legally service an air-conditioning system.

This system can exist extremely complex, and takes numerous other tools and repair manuals to correctly diagnose in virtually vehicles. If performing these steps did not achieve common cold air from your vents or you are not comfy with doing this work, you need to enlist the help of a certified mechanic who has the tools and the cognition to examination your air conditioning organization.

The statements expressed higher up are but for informational purposes and should be independently verified. Please see our terms of service for more details

leonardtrinnow.blogspot.com

Source: https://www.yourmechanic.com/article/how-to-charge-the-air-conditioning-system-in-your-car

Share this post