7 Signs of Low Freon in Car | What to Look Out For

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Written By Nicklaus Frost

Last Updated on: 3rd July 2022, 05:47 pm

What if your car’s AC system is running with a low Freon in a car? How to know it? If I tell specifically, are you not feeling cold air inside the car anymore? 75% of today’s vehicles get attributed to low refrigerant (freon) levels. It’s not a big deal! What matters a lot is when you don’t understand the signs and don’t fix the compressor or the leak in the system. Here we go with 7 Signs of Low Freon in a car to look for. Read below!

7 Signs of Low Freon in car

1.  You’ll find car AC come up with warm air

The foremost sign of low Freon levels in a car is the warm AC that blows warm temperature air and makes the interior uncomfortable. An air conditioning system contains pressurized refrigerant inside it. When the refrigerant drops too low from the actual margin, the AC gets decreased in performance.

2.  Don’t you listen ‘Click’ after A/C turned on?

Have you checked if your Car’s AC has a lack of corruption or not? A well being AC makes a ‘click’ after you turn the clutch on. It’s the sound that signifies the clutch engaging. I experienced no sound/click in my car last week after I switched the car AC and instantly had a diagnosis. I found that my AC is running out of sufficient refrigerant for the compressor to pressurize. Get to know if your AC system is clogged to run!

3.  Do you see a clear refrigerant leak?

Please, check the refrigerant for apparent leaks. CF Experts tell the refrigerant leak to be a significant symptom of low Freon levels. The refrigerant leak looks like a ‘thin’ greasy substance. Where to find these leaks? A refrigerant leak is often under the hood, inside the cabin, or on the compressor. If it looks like you have refrigerant leaks, please go to a nearby auto repair shop. Be mindful of consulting an ASE-Certified technician for more value. Hope, you solve your A/C or Freon issues ASAP!

4.  Check the ICE on Compressor; is it running low?

Most of the time, short ice on the compressor indicates low Freon levels. Why are these caused? During the period, the moisture takes the place of Freon. However, If I talk specifically, it’s easy to recharge Car’s Freon yourself if you’re a professional mechanic.

5.  Loss in cooling capability

You’ll feel warm air inside the car. Besides, a vehicle gets through a noticeable loss in cooling capability. We have told earlier that an AC contains plenty of refrigerants that express maximum cooling inside the vehicle. Once your car has low Freon, it will drop the quiet operation of the cooling system. Are you feeling the same as your car A/C not blowing cold air at all? There is a big chance; you’re going through low Freon in Car.


Are you looking to replace lost R-134a refrigerant and oil in the car A/C system? You can check Interdynamic’s Car Air Conditioner R134A Refrigerant'(found here on Amazon). It’s pretty easy!

6.  AC Condenser Blockage

What a car condenser does? It plays a significant role as the evaporator, high-pressure converter and optimizes maximum cooling through a high-pressure coolant liquid. While driving, it makes airflow that comes through time. After going for long mileage, you’ll see dust and dirt making AC Condenser blockage. As a result, hot air comes from the AC as the car’s system is equipped with an overheated refrigerant.

7.  Unclear liquid moving sight

Modern vehicles are engineered with sight glass; through that, it’s easy to inspect refrigerant movement visually. You’ll get to see the liquid side, high-pressure line, and fluid moving. A well-charged system will show precise fluid moving. On the other side, low refrigerant levels are indicated with a bubbled or blur appearance.

Products you may need:

1.  Car AC R134A Refrigerant Kit

The kit includes three items- AC Recharge Kit (20 Oz), A/C stop leak kit (3 Oz), and A/C Pro vent & duct cleaner. Through this kit, you’ll gain lost refrigerant in the A/C system, help to remove malodor caused by stale air and smoke, and equipment recovery.

2.  AC Diagnostic Manifold Gauge Set (BEST For fREON CHARGING)

Do you need a professional gauge set for R134A R12, R22, and R502 refrigerants? Choose this product for AC charging, diagnosis, and maximum working pressure. It’s time to get something that stands for a long lifespan use.AC Diagnostic Manifold Gauge Set


  • A long-lasting manifold gauge tool
  • Three pieces of Freon charging hose (for high pressure, low pressure, and refrigerant bottle)
  • Ideal for auto mechanics
  • Include a detailed parts diagram
  • Two years warranty

Check on Amazon.

How to tell if your car AC needs Freon

Relevant Resources: How to Remove Refrigerant From Car AC: Professional’s Guide

How to tell if your car AC needs Freon?

What do we know about Freon? A pressurized gas and lubricant are used inside the AC to provide maximum cooled air, and the Freon consists of these organic solvents. We specify vehicles with different refrigerant use. Have a look below.

Vehicle’s with (a) production date & Refrigerant type

An air-conditioning system can be affected due to an incorrect compressor, evaporator, accumulator, expansion valve, and many more components even though we refer to it as “Freon.” Let’s know three signs regarding ‘How to tell if your car AC needs Freon?’

1.  If You Lose Refrigerant While Driving

All of a sudden, you’ll see the cooling temperature of the AC system is disappearing. Even in everyday driving, the air-conditioning system is hampered due to the compressor or clogged clutch. Plus, there is a high chance of catastrophic hose or seal leak. Do you hear a hissing sound coming from the compressor? Then, the refrigerant has been lost from a damaged hose or seal.

2.  If the Visual Refrigerant Leaks

The vital job of understanding a visible air-conditioning leak is diagnosing the total evacuation of refrigerant. The refrigerant contains coolant to improve AC performance. I recommend analyzing the compressor’s front shaft seal, pressure lines (high-low), fittings, evaporator, and accumulator gradually. Do you see liquid steam on a damaged component? A slow leak is often detected during the time. Could you fix it?

3.  You get to know with AC Gauge Readings!

It’s essential to measure air-conditioning data with an AC gauge. You better know using the pressure gauge if you’re an expert, aren’t you? Do the operation with the engine and AC off. If you find 0 readings, it indicates a total refrigerant loss.

How often does CAR AC need to be reCHARGED?

Upgrading a car air conditioning unit is essential, or else it’s hard to get into a vehicle on a summer’s day. A car A/C loses its appeal due to refrigerant leaks, clogged filters, and worn out seals. Carfiction’s mechanics recommend regassing Car’s AC every one to two years.

Some modern cars can go for five years without a recharge. Still, it is wise to put your car for regular service. As research, we have estimated that a new vehicle loses 10% of the refrigerant gas annually.

Relevant Resources: How to Quiet RV AC: A Details Guide

How to add Freon to car Ac

How to add Freon to car Ac?

It’s heart-broken to feel hot air coming from the vents. Who doesn’t expect their car to be as cold as it used to be? Around 75% of drivers face low on refrigerant in an A/C system. Do you know adding Freon or recharging an air conditioner is relatively inexpensive and can be done in just a few minutes? It doesn’t cost much, but around 30 dollars and some minutes of your life. Let’s see HOW TO ADD FREON TO CAR AC? We contain information on AC recharge with refrigerant 134a.Two 12oz. cans of r-134a refrigerant

Alert: Don’t read these steps if your car likely uses R-12!

Things you’ll need:

Step 1: Assemble the Dispenser

Before starting this step, we recommend putting on protective goggles now.

Insert one of two refrigerant cans into the dispenser, and start screwing all the way. Most dispensers have a needle to pierce the can automatically.

STEP 2: Check if the Compressor Is Running

Now, get into the vehicle, turn the engine, and start the A/C. Be mindful of turning the fan to maximum switch. You should follow the hose and go to a cylindrical device attached to the engine; I mean, it’s the compressor. Why not locate the pulley on the compressor? Please do it now! Please, have check if the center part of the pulley is spinning. If it is turning, then the compressor is completely engaged. If it is not spinning, please add some r-134a to engage a mechanic. Keep the A/C on until the entire filling process is done!

STEP 3: LOCATE THE LOW-PRESSure Side (Refrigerant Fill Port)

What’s next? It’s time to pop the car hood and locate the refrigerant fill port. The port is found on the low-pressure side of the system. I hope you find it with a small plastic lid and ‘L’ printed on the cover. Unscrew the lid.

Danger: Do not touch in the engine bay you are unfamiliar with as they get very hot by the high-pressure side.

Relevant Resources: How to Bleed off an Overcharged AC: 4 Ways to Avoid Overcharge

STEP 4: Attach the Dispenser

You’ll find following directions from an expert. If you’re the expert, you know better than handing the dispenser. Please find out the end of the hose and lift the connector’s outer ring this way. You’ll find a trigger through this; it is easy to purge the hose of any air. During the process, be mindful of pressing the connector onto the fill port. At length, release the trigger.

STEP 5: Recharge THE AC System

Take a pressure reading, and fill the system with refrigerant. Check this video to know ‘How to recharge your AC system’ on YouTube properly.

STEP 6: You’re done!

You could do everything right if it went as planned. Let us know if you can recover your car’s air conditioning like ice cold! For better work, consulting an expert is our prime recommendation.

Final talks

Are you benefiting from us? You should be! We make it easier to detect low Freon in Car with seven quality signs. Checking the entire A/C system with gauges will help to identify small or possible leaks. Repairing the leak is essential before refilling it with fresh refrigerant (found here on Amazon). Why not make your Car’s A/C components upgrade and ensure your air conditioning unit’s longevity today?

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