Home / How To / The car’s air conditioning does not take Freon

The car’s air conditioning does not take Freon



You notice that your car air conditioner is not working as well as it should, so you decide to add some Freon to the top of the system. What is the best method? Follow along and we will discuss replenishing your car conditioning with Freon.

Compressor rotates

Start your engine, turn on the air conditioner and check if the compressor clutch shoe rotates with the pulley. The compressor has a magnetic coupling that switches the compressor on / off if necessary. If the clutch shoe does not rotate, you must find out the cause and correct it. The air conditioning system has a low pressure switch that shuts off electricity to the compressor coupling and disconnects it when the Freon pressure is too low.

car AC compressor unit

If the compressor clutch shoe does not rotate, but the pulley is, you can disconnect the electrical connection on the low pressure switch and put a jump wire in the harness that jumps the connection on both terminals. This should engage the compressor clutch. Now that the compressor is rotating, you can try charging.

Car parts stores sell a charging hose / canister charging kit that you can connect to the low side charging port according to the instructions that come with the charging kit.

hose / can drain kit for car AC

These charge kits have some inherent dangers, and the instructions that follow should be followed carefully. Safety goggles are a must when working with Freon as escaping coolant can freeze the eye and cause blindness. Gloves are a good choice as the release Freon can be extremely cold and fittings on the air conditioning system become very hot when the system is in operation. Tap the Freon can and open the valve to start charging.

Hold Freon can stand upright to charge only with gaseous Freon. Turning the can upside down is charged with liquid Freon and should only be done by professional AC technicians. Charging with liquid Freon can overload the system, dilute the circulation oil and cause damage to the compressor. The Freon can should be emptied in a few minutes and the air from stream openings should feel cooler than it had felt. If Freon can not lose weight, you need to change tactics.

Connect refrigerant manifold kit

AC AC manifold meter

Connect a coolant manifold set to the system by connecting blue hose to the low side port and red hose to the high side port. Turn on the valves and read the meter. Note if there is a pressure difference between the meter readings. If the meters are read close to it, it indicates that the compressor is not working properly, possibly due to internal components that are broken, e.g. a water valve. The compressor is repaired or replaced to make it work so that the system can be charged.

If the high side meter reads very high pressure while the low side meter reads very low pressure, it indicates a blockage in Freon’s free flow. This usually occurs at the expansion valve / orifice tube and will require replacement and / or cleaning of the component.

A pressure difference of at least 150 psi enables a Freon charge by connecting the yellow hose from the coolant manifold to the can drainer and putting the valve on the drawer, cleaning the hose and then turning on the low side valve. The air conditioning system should start charging right now. It takes several minutes to empty a can of Freon. Keep adding Freon until the meter readings meet the specifications of your car. Because air conditioning performance varies between systems, follow the specifications of your application.

Remove manifold gauge

Disconnect the manifold gauge and be careful not to burn yourself as the fittings become extremely hot. Remove the jump wire from the low pressure switch and reconnect the wiring harness. Now you can relax and enjoy the cool air from your newly charged air conditioner and get the satisfaction with a well-made DIY.




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