Safety Glasses
Gloves
A/C Pro R-134a Refrigerant
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1234YF Refrigerant
Step 1: Remove the low pressure port cap
The larger of the two tubes coming off the compressor is the low-pressure line. This line has a low-pressure port with a cap on it, which is where we’ll be attaching our A/C Pro hose. The port will be about the width of your thumb. Remove the plastic cap and put it some place safe.
Step 2: Turn on your A/C system
If you didn’t turn on your vehicle earlier to locate the compressor, start your engine and crank your A/C up to Max-Cool with the fan on High.
Step 3: Prepare the A/C Pro Refrigerant can & connect it to the low-pressure port
Twist the plastic safety disk off the A/C Pro can—it can be discarded. Attach the gauge assembly to the can by firmly twisting it on. Don’t remove it from the can until it’s completely empty. Shake the can well before using it. Push the quick-connect fitting at the end of the recharge hose down onto the low-pressure port. The quick-connect fitting will only fit on the correct port. You’ll hear it click into place. Tug on it gently to make sure it’s seated properly.
Step 4: Read the gauge
Now, you’ll use the gauge to read the system pressure.
Read the pressure indicated by the gauge needle only when the A/C compressor is running—you’ll know it’s running when the clutch in the center is spinning. It’s normal for the compressor to be turning on and off. The reading on the gauge will probably be in the red when the compressor isn’t running. If your compressor isn’t coming on at all, even with your air conditioner cranked up, it could mean your system is low on refrigerant. In that case, you’ll want to add a few ounces of A/C Pro. If you add A/C Pro and your compressor still isn’t coming on, you’ll need to take your vehicle to a professional technician. So, wait till the compressor is running, and check the reading on the gauge.
Step 5: Gauge readings
If the needle is in the red or “high pressure” section of the gauge when the compressor is on, do not add refrigerant—your system needs to be serviced by a professional technician.
If the needle is in the yellow section of the gauge, no additional refrigerant is needed, and you’ll need a professional technician to help you diagnose why your vehicle’s A/C isn’t blowing cold.
If the needle is in the white or “low pressure” area of the gauge, your system needs refrigerant.
Step 6: Add refrigerant
Start by double-checking that the hose is attached securely to the low-pressure port. Hold the can vertically and squeeze the trigger to add refrigerant. While charging, shake the can up and down, alternating between holding the can vertically and horizontally every few seconds. Every ten to fifteen seconds, release the trigger and check the system pressure. Remember to wait until the compressor is cycling before checking the reading on the gauge. Continue this process of charging and checking pressure until the needle moves into the green area.
Once it’s there, you’ll know your system is properly charged.
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Do It Right: It’s important not to overcharge the system—more is not necessarily better when it comes to refrigerant. Too much will cause your system to blow warm air and can damage costly components. |
Step 7: Disconnect the hose & store remaining refrigerant
To disconnect the hose, pull up on the collar around the connector to release it from the port, then replace the cap on the port and turn off vehicle. If there is any A/C Pro left in the can, leave the charging assembly attached, and store it in a cool, dry place.
