Air conditioning system stopped cooling and blows hot air even while adding refrigerant.

My LR3 air conditioning system stopped cooling and blows hot air even while adding refrigerant. The key problem now is that the refrigerant does not get into the system during the refilling process. What could be the problem?

My car has 60000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hi there. Check the air conditioning system for any signs of leaks. Check all of the hoses and see if any of them have a hole rubbed in them. Check the compressor for any signs of leaks around the clutch pulley area. If you do not see any visible leaks, then use a spray bottle of water and dawn dish soap to spray all of the components to the air conditioning system. Where ever the soap bubbles as you charge the system, that is where the leaks are. I recommend seeking out a professional, such as one from Your Mechanic, to help you with finding the leaks and repairing the system to OSHA standards.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The most common reasons a Land Rover LR3 ac isn`t working are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor. You may not realize there`s a refrigerant leak until the air conditioner stops blowing cold.
What Happens When My AC Leaks Refrigerant? Low refrigerant levels put undue stress on your compressor, since there is a change in pressure that causes the compressor to work harder. Eventually this causes the compressor to overheat, which leads to your entire unit burning out and failing.
Leaking or Low Refrigerant

If your central AC is not blowing cold air, the refrigerant may be the problem. The unit could be running low and need additional refrigerant added. The most likely cause of this is a leak.

Many factory a/c systems lose their charge when the a/c system is not being used. This happens as an under-lubricated seal around the compressor`s crankshaft dries up and develops a leak that allows for refrigerant and/or oil to escape.
Here are some of the most common causes of why air doesn`t flow out of your vehicle`s vents: Your air intake is clogged, meaning that air isn`t getting in from the outside at all or isn`t circulating properly. There is a blown fuse in the ventilation system. Electrical issues such as a bad relay.
An AC refrigerant leak is fairly common but not always obvious. Coolant leaks can greatly affect the efficiency of an HVAC system. Also, when leaks happen, home comfort is adversely affected. Plus, there are certain health issues that could come into play if the leak is not resolved immediately.
Coolant Leaking Externally:

If the air compressor is leaking coolant externally, it`s probably either a head gasket or a fitting. In some rare cases the leak can be contributed to a cracked head. In order to find the leak, you will need a can of break clean, a mirror, and a good light.

If your air conditioner is running, but not lowering temperatures inside, one issue could be a blocked or clogged condenser coil. When operating correctly, the condenser fan draws air into the outdoor unit through the condenser coil to pull heat energy out of your home.
Wear and tear of the rubber parts of your system is the most common cause of leaks. While much of your air conditioning system is made of metal, including the high pressure lines, parts of the system are rubber.
Leaks — often mean that refrigerant will be escaping the system somewhere along the line. Compressor leaks typically happen around the shaft seal, hoses, O-rings and gaskets.
So if you turn on your AC and hear a rattle, it may mean you have a failing or bad: AC compressor. Rattling or your car air conditioner making loud humming noises which get worse as you accelerate can both be signs you need to replace your AC compressor.
Some of the most common reasons a central air system stops working include: coolant has run too low, the air filters are blocked or dirty, the coils are frozen over, or there is an electrical issue. To help you troubleshoot what exactly is wrong with your central AC, we`ve detailed the most common issues below.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Air conditioning system stopped cooling and blows hot air even while adding refrigerant.
ANSWER : Hi there. Check the air conditioning system for any signs of leaks. Check all of the hoses and see if any of them have a hole rubbed in them. Check the compressor for any signs of leaks around the clutch pulley area. If you do not see any visible leaks, then use a spray bottle of water and dawn dish soap to spray all of the components to the air conditioning system. Where ever the soap bubbles as you charge the system, that is where the leaks are. I recommend seeking out a professional, such as one from Your Mechanic, to help you with finding the leaks and repairing the system to OSHA standards.

Why is my air system blowing out hot air in spurts and why is the temperature gauge nearing hot while in use?
ANSWER : This can be caused for a variety of reasons such as a malfunctioning thermostat, a radiator not flowing properly, a faulty coolant temp sensor or AC refrigerant not properly being supplied to the AC compressor. Your car’s AC system puts a heavy strain on your car’s engine when it runs as it requires a lot of power to run. When the AC compressor comes on it puts additional strain on the motor that may be already struggling to stay cool as a result of any of the issues named above. I would recommend having an expert from YourMechanic come to your home to diagnose and repair.

Hot air mixed with cold blows from air conditioning
ANSWER : Hey there. You will most likely have to have a mechanic bypass the heater coolant lines to have this resolved. Your A/C may not be controlling the air flow inside the evaporator correctly out of the vents and may be the blend door actuator stuck in the heat position. Have the AC system diagnosed first before bypassing the heater.

While driving defroster set to hot blows hot air as it should, while idling it is blowing cold air.
ANSWER : First, the coolant level should be checked to make sure the radiator is full. While the overflow tank may be full, the radiator cap must be taken off to check the level inside the radiator. If you find the level is very low, you have a coolant leak that must be fixed. If coolant levels are normal, an engine thermostat or heater control problem may be what you’re experiencing. Consider hiring an experienced technician like one from YourMechanic who can come out and take a closer look at your lack of heat concern to offer a more personal diagnosis.

My 2003 Hyundai air conditioning works fine but often starts blowing hot air, especially when idling.
ANSWER : Hi There,
It sounds like you may have a condenser fan that may not be cooling the AC condenser properly. As you may know, the job of the AC condenser fan is to cool down the AC condenser as it generates a lot of heat during the course of its primary function, which is to convert the AC gas refrigerant into a liquid form, a process that generates a significant amount of heat. As the AC condenser fan blows cool air across the condenser, this allows the condenser to remain cool, keeping the pressure down in the AC system which helps to generate cooler air. I would suggest having a professional from YourMechanic come to your location to take a look at your vehicle.

air conditioner started making loud screeching noise and started only blowing hot air, then the noise stopped but still only blows
ANSWER : The noise is possibly from a failed compressor clutch or the compressor itself is faulty. Another possibility is the pulley bearing on the front of the compressor has failed. The issue should be fairly evident to the inspecting mechanic after some simple tests. To resolve this, the recommended diagnostic is an a/c system inspection. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

A/C blowing hot air, filled 3 weeks ago with refrigerant and helped now refrigerant not cooling it.
ANSWER : Your car uses a refrigerant called R134a. If the re-charge 3 weeks ago resulted in your system working at that time, but a slow degradation in cooling effect has occurred since then, the most likely explanation is you have a leak somewhere in the system. The most common leaks are at compressor shaft deals and o-rings. YourMechanic can pressurize your system with nitrogen and then determine where the leak is using for example an infrared refrigerant leak detector and repair it.

Do NOT use stop leak products and even leak detecting dyes can be problematic UNLESS specifically approved by GM technical services. If you want a long term, professional fix, the best thing to do is find the leak and simply repair it, not mask over it with "stop leak". Once the leak is found and repaired you will need to replace your receiver/drier as part of the repair and add the required amount of refrigerant oil to the drier. Evacuate THOROUGHLY to remove all traces of moisture.

If you have YourMechanic diagnose the issue with your AC and do the job according to the instructions, you will be freezing when it is complete.

Air conditioning is blowing hot air – car stalls when A/C is on
ANSWER : In order to diagnose all the different problems you have, I having the A/C pressures checked to see if the system is low on refrigerant from a leaking compressor or another component. The rough idle may be due to a dirty throttle body and idle control system. If you would like to have this checked for you, a certified professional from YourMechanic can come to your car’s location to inspect the A/C and rough idle in order to proceed with the proper repairs.