![]() If your car’s AC system is empty of freon, you need to make a leak check before refilling it. Freon is bad for the environment, and you can do very expensive damage to your AC system if you don’t have the proper expertise. We strongly suggest using a certified workshop to fill and check your air condition system. If there’s nothing inside the sight glass, it’s safe to assume that it’s void of Freon. However, when the system gets low, there are going to be bubbles present. At optimal levels, the clear fluid will be moving freely through the line. Through the sight glass, you can see the Freon on the high-pressure side. If you have this setup, it’s simple to tell when the car needs more Freon. Some vehicles are equipped with a sight glass on the air conditioning system. If you get anything lower than this, the system needs Freon. ![]() With the engine running and the air conditioning on high, the low side might read between 35 and 40 psi, while the high side is going to register between 200 and 350 psi. Start by reading the gauges with the engine turned off. Connect the manifold gauges to the low- and high-side ports. If you are performing some basic AC checks, you might notice that the system is low. RELATED: Does AC Stop Leak Sealer Work? (& Is it Bad?) 4. Sometimes, you will notice a white-colored cloud from wherever the leak is, and you could hear hissing as the pressure is lost. If there is a leak in the fittings, hoses or seals, the Freon can be lost much faster. Of course, there’s always the chance that there was a more abrupt loss of Freon. If you think you see it, wipe it down and see if it comes back. Check the pressure lines, condenser, fittings, accumulator and other components to see if you notice any of this oily substance. It can appear on the surface as grease with a lighter color. You might notice where the leak is occurring because of the oil that is in the refrigerant. Leaking SystemĪir conditioning leaks are one of the most common causes of low Freon. RELATED: 5 Signs of a Bad AC Compressor Clutch (& Replacement Cost) 3. However, this problem is also common when there’s a blown fuse, a poor ground connection, or a bad engine coolant temperature switch. If the Freon levels get too low, the clutch may not engage. You know it’s happening because you hear the typical clicking sound that occurs when it’s engaged. When the air conditioning system works as it should, the clutch engages to pressurize what’s inside the compressor. RELATED: Car AC Not Blowing Cold Air? Common Causes 2. However, this problem can also be caused by a bad condenser or compressor, so you need to do some diagnostics before adding Freon. When the system isn’t working right, you might first notice that the air becomes warmer or simply doesn’t get as cool as it once did.Īs the amount of Freon in the system continues to decrease, the air should get warmer. The entire purpose of having air conditioning in the car is to keep the cabin cool. Here is a more detailed list of the signs of low freon in a car to look for: 1. The main symptoms of low freon in a car include:
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