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Get an r134a refrigerant add kit from Walmart or your local auto parts store.
You can even get a can of Arctic Freeze by Intermatics that has a hose and a gauge on it.
Connect the hose to the low side port. You can find this port on the 'thicker' piping that comes off of the compressor (versus the thinner piping that comes off the compressor which is the high pressure side).
Pressure should read 25 psi to 45 psi on the low pressure side when the compressor is running and the a/c is on.
Pressure should read 75 psi to 100 psi on a hot day when the car is off.
However, you'll want the a/c to be running when you add freon.
Press the button on the can to install more freon, if needed.
BOTH High and low readings should be checked to have a better idea of what is going on with an AC system but based on the limited information… the compressor is not engaged or is not pumping. Below are some things I would check;
1. Check the high and low gauge readings with the AC on & set on MAX/Recirculate, middle vents with the engine at 2,000 RPM’s, blower speed on high.
2. Check the vent temperatures with a thermometer from the middle vents, far right & far left vents?
3. What is the outside temperature at the time the readings were taken? 4. Check to see if the condenser fan blowing strong?
5. Notice if compressor clutch is cylcling excessively. Could be overcharged, not enough air going across condenser fins, compressor not pumping sufficiently… BOTH gauge readings are really needed to get a better idea. Below are normal car AC pressure readings with 134A.
Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI
Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI
Normal high side reading ranges from 200-350 PSI
Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor
Thank you for using fixya and good luck, keep me posted. Be glad to help you get your A/C running again soon.
ac lines under the hood carry r134 through the ac system. there are high pressure lines and low pressure lines. each side has an opening for service. it is not uncommon for the system to lose refrigerant and either be less efficient or not work at all. to add freon to the system runs the risk of overcharging which will cause the system to run less efficient and possibly cause damage to the compressor or seals. the charging or adding of freon is always done to the low side and you can identify the low side by the size of the line. you will see there are two obvious sizes of lines. find both connection points first and make sure you know you are dealing with the larger lines which is the low pressure side. attaching to the high side could cause a can to explode and you could be injured!! with the engine running and the ac on its coldest setting with the fan at maximum speed you open the freon can with it in the upright position. verify that the compressor is engaging the clutch on the compressor. cans usually contain about 12 oz of freon. stay away from the mixes that try to give you stop leak and lubricant. try one can and see what you get. about those lines the size of the high side is like a pencil and the low side is like a magic marker. that should help you identify them. if you need more please reply and good luck
On that model,it will cycle on and off while you add freon.If it does not ,then the ac system might have a problem.The low side pressure switch is located on,or near the accumulator .Unplug the switch and take the wire end plug and connect the two plug in`s together(cross it out on the wire).This will make the ac compressor engage and you can charge the system,do not leave the wire connected,plug it back up to switch.If the ac compressor does not come on ,then have the system checked out.
it could be one of 2 things.
you didn't vaccum it all the way or there is b clog in the system. next time u flush it run about 1/8 cup of rubbing alcohol through it . then push clean air through it. then refill it. if that doesnt work replace the seals on the compressorlow and high side lines/manifold.