How to recharge Chevrolet Air Conditioner AC Yourself

How to recharge Chevrolet A/C Air Conditioner Yourself

Last Updated on Monday Apr 23, 2018

In this guide, you will find instructions on how to recharge air conditioner system on Chevrolet vehicles. If your A/C is blowing hot air, there is a chance that the system may be low on freon. Charging Chevrolet A/C system with refrigerant is easy and takes about 15 minutes.

The instructions in this guide will help owner of Chevrolet Spark, Sonic, Bolt, Volt, Cruze, Malibu, Impala, Camaro, Corvette, City Express, Trax, Equinox, Traverse, Tahoe, Suburban, Colorado, Silverado, Sonic, Blazer, Astro, HHR, Uplander, Avalanche etc. charge the A/C that are filled freon (R134a). Note that the A/C charging port can vary between Chevrolet models but in all cases, it will be located in the engine bay.


Common symptoms that your Chevrolet is low on refrigerant include:

  • A/C blowing hot air even when the temperature is set to cold settings.
  • AC blows cold then hot,
  • AC blows cold sometimes,
  • AC blows colder when driving, ac blows cold air then stops

What you will need



Before you start recharging Chevrolet A/C system make sure that other components are in working condition. Chevrolet A/C may stop working if it is low on freon but also due to other problems such as A/C compressor not working, bad A/C clutch, bad temperature sensor, major freon leak etc. 

Step 1: Park Vehicle

Park your Chevrolet in a safe area. Turn off the engine.

Step 2: Open hood

To add freon to your Chevrolet you need to locate the A/C low pressure charging port in the engine bay. Pull the hood release under the dashboard until you hear your Chevrolet hood pop open. 

Step 3: Locate A/C port

location of a/c low pressure port on Chevrolet  3rd

Next, locate the low-pressure port, item 11. This picture shows where the A/C charging port is on various Chevrolet vehicles. Note that there also is a high-pressure line as well. The A/C charging kit connector will not fit on the port for the high-pressure line.

Step 4: Connect recharge kit

Carefully remove the cap from the low-pressure port by twisting it counterclockwise. Connect your A/C hose to the A/C charging port. You are almost ready to add freon to your vehicle A/C system. Don't start adding refrigerant to your Chevrolet A/C system yet.

Step 5: Start Engine

how to charge the ac on Chevrolet

Start the engine and allow your Chevrolet to idle.

Step 6: Turn A/C on

Next turn A/C on and set it to max cold setting. Set the blowing fan to maximum speed. Now you are ready to recharge Chevrolet A/C system.

Step 7: Charge

Add refrigerant as directed by the A/C recharge kit you are using. Press and hold the trigger until your Chevrolet A/C is charged. This process can take several minutes. When the a/c system is low on freon, the compressor may not be engaged at first. As you add refrigerant you should see the compressor kick in.  As you charge the system stop charging the system every minute to obtain a pressure reading.   Continue adding refrigerant until your gauge reaches in the charged range. Do not allow the system to overcharge.

 Important Notes

  • Keep the can upright and rotate it between 1 and 2 o’clock as you charge the a/c. 
  • If your vehicle uses a clutchless compressor also known as variable displacement compressor, the clutch will always look as being engaged. 
  • Do not overfill your system with freon. 
  • Do not turn the can upside when you charge the A/C. It can introduce liquid refrigerant to a/c system which can cause the locking up the a/c compressor.
  • Always follow the instructions that are provided with your specific kit.
  • It is normal for the gauge to point in the high range when the engine is turned off.

Frequently Asked Questions

The most common problem is vent actuator in vehicles with dual zone A/C. They can get stuck in one position and do not switch when you change the temperature. In vehicles that use duo-valves they can also get stuck in which case half of the car blows hot air and the other blows cold air.

The cooling fan for the condenser may not be working.

The blower fan may be defective.

AC may be low on freon. Also check low-pressure switch. If defective it can prevent the compressor from operating.