How to Purge Air From Car AC System?

A. Check your owner’s manual to see if there are any special instructions for your car, such as a specific amount of time to run the engine or whether you should be driving while purging the system.

B. If your car doesn’t have a separate “A/C” button, turn on the air conditioner in any mode except Max A/C and leave it running until the display says Recirculation.

C. Turn off the engine, then turn on the air conditioner again and set it to Max AC. This will ensure that all of the old refrigerants have been removed from the system before adding new refrigerants.

What is Purging?

Purging is the process of removing air from the AC system.

The purpose of this is to ensure that there is no moisture in the system, which can cause corrosion and reduce the cooling efficiency.

There are two ways to purge: with a canister and without a canister.

If you have a canister, it will have a valve on it that allows you to release any air that may be trapped inside.

You can also use gravity to help pull out any excess moisture by turning your car on its side and letting it run for about 30 minutes before starting your drive again.

When do you need to purge the air from your AC system?

When it’s time to perform an AC repair, the first step is to remove all the air from your car’s AC system.

To do this, you’ll need to open up the hood and locate the condenser unit. This is usually located on top of the radiator and is made up of a series of hoses and fans.

The purpose of this unit is to cool down refrigerant gas before it reaches your vehicle’s compressor. It also helps keep humidity levels down so that your AC works properly

Step 1: Opening up the hood

To start, locate the condenser unit under the hood and make sure all hoses are connected tightly to their respective ports by hand tightening them with a wrench if necessary.

Then use a hose clamp wrench to tighten each hose connection further until there is no give in any part of it when you push down firmly with your hand against it

What causes air to get into our car’s AC system?

The most common cause of air getting into your car’s AC system is a leak in the air ducts.

As you drive, the air that comes from your vents contains some moisture, which can condense into the water if it’s cold enough.

This water will leak out through any pinholes or cracks in the ductwork, and then run down into your AC compressor.

The motor will keep turning and pumping out more cold air, but you’re only getting water-saturated air back out of your vents.

If you notice that you’re getting wet when using your AC on a hot day, this may be what’s happening.

You should take your car to a shop as soon as possible so they can find and fix the leak before it damages any other components.

Make sure all doors are closed

If any doors are open, the air conditioner won’t work as well because it can’t draw in cold air from outside.

Start your engine, then turn on the heater at full blast for one minute or longer. This will help clear out some of the old refrigerants that may have leaked out.

Turn off the engine and remove any other sources of heat or cold so that you can let coolant circulate freely through your system without being blocked by anything else.

Locate where your car’s A/C condenser is located it should be near where your radiator is situated and check for signs of leakage or damage. If there’s any damage or leakage, take it in for repair immediately.


You should know that purging the air from your car’s AC system is a very important step to take.

You don’t want any air in there because it can cause problems like inefficient cooling and decreased performance.

So now that you’ve learned how to purge your AC system, go ahead and do it.

Steven Hatman
Steven Hatman

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