No Freon In Car Ac

No Freon In Car Ac – If the vehicle is older than 6-8 years and the cooling effect of the air conditioner has decreased over time, there is a good chance that this is due to a lack of refrigerant in the system.

Some time ago I added coolant to my Polo’s AC system. The cooling effect of the air conditioner in my car is significantly reduced and I can feel it during my daily drives. I started hearing a strange hissing sound coming from the vent that wasn’t there before. I decided to read more about how the refrigerant in a car AC system is recharged and realized that if the system is out of refrigerant and there are no problems with other system components, it is relatively easy to top up and restore cooling. Post a dedicated and detailed DIY thread in our repository for performance reference.

No Freon In Car Ac

No Freon In Car Ac

When a problem occurs, I immediately check all connected components of the HVAC system:

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Lack of refrigerant in the system can lead to ineffective cooling. Even if the system is completely sealed, the coolant level drops due to wear of the rubber seals/O-rings in the hoses and metal tube connectors and gradual leakage of coolant over time. If a metal pipe or hose or condenser coil is punctured by a sharp impact of a stone, the refrigerant will escape again. Sometimes a very small amount of gas leaks from the shredder valve into the charging port of the car. But if the car is more than 6-8 years old and the cooling effect of the AC has decreased over time, there is a high probability that this is due to a lack of refrigerant in the system; As happened to me. So far I have never refilled the AC refrigerant. But at this point, I don’t know if there is a leak in the system.

The type and amount of coolant used in a car is indicated on a sticker stuck on the engine compartment or hood.

An AC manifold setup is used to charge or discharge refrigerant from the system and measure pressure on the low pressure (LP) and high pressure (HP) lines. It has a brass manifold with 2 pressure gauges – one for the low pressure side marked in blue (marked from 0 – 220 psi) and the other for the high pressure side marked in red (marked from 0 – 500 psi).

Valves are installed on both sides that control the flow of coolant through the 3 threaded holes on the manifold. During refrigerant charging, the LP side valve opens and refrigerant flows from the tank (stored at high pressure like your LPG cylinder) into the system (low pressure side) in liquid form. The manifold has a gauge glass in the middle that shows the flow of refrigerant during charging.

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Color-coded hoses are used to connect the collector to the system. Same as pressure gauge, blue for LP side, red for HP side and yellow for filling or emptying. The color code is for easy identification – otherwise the hoses are identical in connector and size.

At the end of this hose is a threaded shredder valve, just like on a tire. Push the pin in the center and the gas will come out.

To connect the hose to the LP and HP ports of the car, quick coupling fittings are provided. They are also color coded – blue for the LP side and red for the HP side.

No Freon In Car Ac

Fast coupling is reliable due to different openings. LP quick coupler has a small opening while HP has a large opening. Cannot be placed on the wrong connection port.

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This quick coupler is connected to the filling port in the car just like the LPG gas cylinder regulator we have at home.

When filling the system, the yellow hose is connected to the coolant tank with a threaded valve. Valve ends are pointed:

Turn the valve clockwise and it will puncture the can, open the valve counterclockwise and the refrigerant will come out. Be careful to keep the valve open before tightening on the can; Otherwise it will burst the can and the coolant will leak out!

During coolant recovery or vacuum production on the system, the yellow hose is connected to the recovery unit or vacuum pump. Refrigerant must be transferred from the system to replace a leaking compressor/condenser coil/evaporator coil/hoses or pipes.

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… to park the hose when not in use. This will prevent dirt and dust from entering the tube.

I got a manifold kit complete with hoses and quick connectors from a nearby auto ac parts store. 2300. The good thing is that instead of buying online, I can check the parts and quality in person. In addition, the store agreed to replace the part in the event of a leak, but otherwise made no guarantees. Also, the same setting can be used to charge the refrigerant in the AC home unit with the correct refrigerant; I don’t want to do this at the moment, but it’s good to know it can be done with the same kit.

In this case, even if the valve on the manifold unit is closed, the reading will appear on the gauge because this valve controls the flow of refrigerant from the center port to the LP or HP port.

No Freon In Car Ac

At this temperature, the LP gauge should read between 45 – 50 psi and the HP gauge between 190 – 230 psi from the reference chart. The LP gauge reading is good, but as seen from the HP gauge, the reading is a low 135 psi and indicates that the HP/discharge area is not getting enough coolant flow.

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The yellow pipe now contains a mixture of ambient air + coolant. Air/moisture is bad for the system and must be purged from the line before charging. Gently remove the yellow hose connector at the end of the manifold to bleed air from the hose until the coolant comes out.

You will see the flow of liquid phase coolant through the sight glass on the manifold:

Close the valve. Not all the coolant in the can can be charged into the system at once!

Excess refrigerant does more harm than good – it affects cooling efficiency, can damage compressors, valves and seals. Be careful not to open the LP valve at once!

Read The Label, Heed The Label!

If you are still facing problems, you can visit a good car AC service garage/technician – unlike other car garages, they can diagnose your AC system problems quickly and suggest the right course of action in less time and cost. . I can do it too, but I prefer to do it myself to know the process and learn from it.

Thanks for reading guys. Trust me it helps. Please let me know if you have any comments or feedback or if I made a mistake in my assessment.

PS: If you’re interested, here’s a very useful training manual I found on the internet about AC systems in cars.=========== Multi-Author AdSense ========= Omitted Standard ad slot 1] is empty for [user id 4]. ============================================

No Freon In Car Ac

When I first got the car I knew the air conditioner wasn’t working. The mechanic tried emptying and filling the system and noticed that the pressure was the same on both sides. This means the expansion valve or compressor is not working, both of which are very expensive to repair. Instead of spending the roughly thousand or two dollars to have him do this, I replaced the expansion valve ($20 or so) and got a used supercharger ($100) and set up the system myself. I saved a huge amount of money and now I have the tools to fix it in the future.

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Before you start filling the car air conditioner, you need to understand how it works. Your car’s AC is a closed system, meaning it doesn’t need a “top-up” or “charge” if it’s working properly. Do not use refrigerant. If you find it’s low, you have a leak that you should eventually repair.

A closed system consists of several main components: compressor, condenser, receiver/dryer, expansion valve and evaporator core. The entire system has high pressure coolant, around 40 psi or more for rest. An AC system has two “sides”, high and low. The compressor will take the refrigerant from the low pressure side and compress it, pushing it to the high pressure side, causing it to heat up.

The hot, high-pressure refrigerant then flows through the condenser, which is essentially a radiator. The condenser will cool the hot refrigerant as much as possible before it goes to the dryer. The dryer filters moisture and humidity

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