QuestionI recently tried to fill my A/C on a 2001 hyndai sonata 4cyl I Found a leak due to an o ring but after replacing it and putting one can of r-134a in, there still is no cool air. the pressure was 45psi when the ac is not turned on as soon as i turn it one i hear the compressor kick in the pressure drops to 0 yet no refrigerant seems to enter the system. any suggestions? i do note that inside the car when you turn the a/c on it ther is a sucking of air sound under the dashboard passanger side i opend up the area to see the heating core and i can here air passing thru the lines they are cool to touch but the air doesn't get cold and i can not find a leak.
Answer SERVICE MANUAL
Applies to: Santa Fe 2001
GROUP
Heating, Ventilation & Air Conditioning Air Conditioning System
CHARGING REFRIGERANT SYSTEM (VAPOR)
NOTE
This step is to charge the system through the low pressure side with refrigerant in a vapor state. When the refrigerant container is placed right side up, refrigerant will enter the system as a vapor.
Open the low pressure valve. Adjust the valve so that the low pressure gauge does not read over 412 kPa (4.2 kg/cm, 60 psi).
Put the refrigerant in a pan of warm water (maximum temperature 40°C or 104°F) to keep vapor pressure in the container slightly higher than vapor pressure in the system.
Run the engine at fast idle and operate the air conditioning.
NOTE
Be sure to keep the container upright to prevent liquid refrigerant from being charged into the system through the suction side, resulting in possible damage to the compressor.
Charge the system to the specified amount. Then close the low pressure valve.
Specified amount : 600 ± 25g
When refrigerant charging speed is slow, immerse refrigerant can in water, heated to a temperature of about 40°C (104°F).
WARNING
Under any circumstances the refrigerant must not be warmed in water heated to a temperature of over 52°C (126°F).
A blow torch or stove must never be used to warm up the can.
CHARGING REFRIGERANT SYSTEM (LIQUID)
NOTE
This step is to charge an empty system through the high pressure side with refrigerant in a liquid state. When the refrigerant container is held upside down, refrigerant will enter the system as a liquid.
CAUTION
Never run the engine when charging the system through the high pressure side. Do not open the low pressure valve when the system is being charged with liquid refrigerant.
Close both high and low pressure valves completely after the system is evacuated.
Install the refrigerant can tap valve as described in "Handling Refrigerant Service Tap Valve" section.
Open the high pressure valve fully and keep the container upside down.
Charge the system to the specified amount by weighing the refrigerant with a scale. Overcharging will cause the discharge pressure (high side) to rise. Then, close the high pressure valve.
Specified amount : 600 ± 25g
NOTE
If the low pressure gauge does not show a reading, the system is restricted and must be repaired.
After the specified amount of refrigerant has been charged into system, close the manifold valve.
Confirm that there are no leaks in the system by checking with a leak detector. Refer to Checking Refrigerant Leak.
NOTE
Conducting a performance test prior to removing the manifold gauge is good service operation.
