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Low pressure reading for Feron charge in FrigoGranita slushie machine

Had to fix leak in system and I want to know what the charge pressure on the low side should be to get the best performance from the machine. Can not find any refferance to pressures on the Cecilware web site so I'm puttin this question up for grabs and see which answer sounds the best.

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1 Answer

Google the refrigerant type your installing
& look for a pressure temperature chart
No Freon That is a Dupont trademark & I looked
at their site last week & didn't see it used any more.
You should provide the refrigerant type & you would have
someone give you the answer ,that has a chart or works
with that equipment
R22 is not made anymore & there is a replacement,like
everything else that goes away thanks to the Govt

Posted on Jul 19, 2013

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How much freon goes into my 2000 nissan maxima i have some in there but when my car is not moving my compressor cuts off


Heres the problem, this car holds a total max amount of 25oz of feron (1lb 9oz). you dont know how much is in the system now and without gauges to read the highside and lowside you wont know how much to add, they sell the gauge with the yellow and green and red display but its not accurate. you just dont keep adding until its cold because will will damage the system. the right way is to have a certified ac tech to check and charge the system. there could be a small leak somewhere. to recarge the system correctly it must be evacuated and then vaccumed down then depending of how low the system is you add the right amount of oil. then you add a dye and the correct amount of freon to the system. the dye thats added is used to find the leak. when the system gets warm again there is a blue light and yellow glasses used to located the dye which will be where the leak is, after recharging and testing you then use a freon snifer to check all components and hoses for leaks. if this is something you cant afford at this time then you can try to recharge yourself but take note that just because the compressor is not on means its low on gas. make sure to get the little gauge the sell and read the directions so you dont overcharge the system. also dont use the sealer stuff they sell, only buy the freon with oil and dye in it and dont vercharge, watch the gauge they give you, you will be charging from the lowside which is the small valve, the hose will not fit on the highside, good day.

Aug 08, 2011 | 2000 Nissan Maxima

1 Answer

Location of low pressure port 1996 pontiac firebird


Hello,
The low pressure port for charging the A/C system is located on the larger aluminum tube coming from the A/C compressor. It is usually located in the tube line near the accumulator. That is an alumninum cylinder about the size of a soda can or slightly larger usually located close to the firewall along the left fender side well. It will have a plastic screw on cap on it, usually stamped with an "L" on top. Your recharge hose will only connect to the low pressure side, the high pressure port is a different size valve for safety reasons. You can only get an accurate pressure reading with the engine running and A/C running at max cold. blower on high speed, after about 5 minutes of A/C operation. Temperature outside will also have an effect on the pressure reading, optimum ambient air temperature of 70-80 degrees farenheit. Directions for recharge are on your R134a refill kit, but the system does require 20-30 PSI for the compressor to kick on. If your compressor is engaging while you are refilling, you can probably do it successfully. If your pressure is extremely low and compressor does not kick on, you most likely have a leak in the system which will have to be found and fixed before you can charge the system......Mike

Jun 24, 2011 | 1996 Pontiac Firebird

1 Answer

Will not blow cool air IT ISS FULL OF FERON COMPRESSOR COMES ON


The resolution to your issue depends on the results of many things, the four MOST important is the low and high pressure readings AND the temperature at the condencer and the evaporator. A system full of refrigerant will not cool, and a system low on refrigerant will not cool. There is a balance that must be achieved....

Mar 24, 2011 | 2003 Chevrolet S-10

3 Answers

Air conditioner will not turn on


has the charge been tested< these suffer from leaks, have the system leak tested and then repair and recharge.

Oct 09, 2009 | Ford Thunderbird Cars & Trucks

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AC not cooling in '98 blazer


I think you have a leak. I would get some dye . The local auto parts store sells it with a black light. Then check for leaks .

Good luck

Jul 14, 2009 | 1998 Chevrolet Blazer

1 Answer

I have full gas in my car but still no cold air inside the car


If you over charged the system your a/c will not work. To diagnose problems, an A/C manifold gauge set is needed to read high and low side pressure readings. Avoid adding refrigerant with a simple charging kit like the ones sold at parts stores. Don’t add any stop leak, this can cause problems in the compressor, expansion valve or condenser.
Keep in mind that using an A/C gauge set and seeing BOTH high and low side readings can help in diagnosing the problem when you know what to look for. First, on a 134A system the high and low side service ports are different sizes. AC gauge sets have color coded hoses, the blue color coded hose has a connection that fits on the low side service port and the red hose has a connection that will only fit onto the high side. The yellow hose won’t hook up to anything if just checking the readings; it can be used to connect to a vacuum pump or attached to a refrigerant can or tank.

Normal readings on high and low side with AC OFF (static pressure) - Depends on outside temperature, but normally is between 80-105PSI  Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s - Ranges from 25-35 PSI - Note that on many Chrysler products a normal reading on the low side may be 15-25PSI  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.

With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold - STOP don’t overcharge the system. The only proper way to remove refrigerant is with a AC recovery machine so if this is being done at home I can’t emphasize enough not to over charge the system. And actually the best way to insure the proper charge is in a system, is to use an AC machine to recover the freon and then evacuate and recharge the system with the correct amount. Most cars have the specified amount on a decal under the hood. 

Both low and high side readings are lower than normal, this indicates a cars AC system is low on refrigerant and is under-charged.

If both low and high side readings are too high, this indicates an overcharged system - too much refrigerant. This also can indicate that the condenser fan is not working, is too slow or the car is overheating and heat is transferring from the radiator to the condenser.

Good luck and hope this helps, keep me posted be glad to answer any question you may have. 


Jul 02, 2009 | 1998 Honda Prelude

1 Answer

The a/c on my 2006 honda pilot is not owrking and appears to have a low refrigerant charge. I want to recharge it and find the leak with die. what is the amount of 134a to be fully charged


Adding freon or topping off a cars A/C system is the most common task performed to restore performance and get cold air blowing again. However, adding refrigerant isn’t always the solution for car air conditioning problems. There can be many other things wrong besides a system being low on refrigerant. To diagnose problems, an A/C manifold gauge set is needed to read high and low side pressure readings. Avoid adding refrigerant with a simple charging kit like the ones sold at parts stores. Don’t add any stop leak, this can cause problems in the compressor, expansion valve or condenser.
Keep in mind that using an A/C gauge set and seeing BOTH high and low side readings can help in diagnosing the problem when you know what to look for. First, on a 134A system the high and low side service ports are different sizes. AC gauge sets have color coded hoses, the blue color coded hose has a connection that fits on the low side service port and the red hose has a connection that will only fit onto the high side. The yellow hose won’t hook up to anything if just checking the readings; it can be used to connect to a vacuum pump or attached to a refrigerant can or tank.

*Make sure the condenser fan comes on when the readings are being checked.

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 - Note that on many Chrysler products a normal reading on the low side may be 15-25 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.

With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold - STOP don’t overcharge the system. The only proper way to remove refrigerant is with a AC recovery machine so if this is being done at home I can’t emphasize enough not to over charge the system. And actually the best way to insure the proper charge is in a system, is to use an AC machine to recover the R143a and then evacuate and recharge the system with the correct amount. Most cars have the specified amount on a decal under the hood. 

Hope this helps. Keep me posted, be glad to help get you cooled again. 

Jul 01, 2009 | 2004 Honda Pilot

1 Answer

A/c blow hot air then cool air been doing this about two weeks now.when compessor turns on shakes whole car. and turns off and on every 5 to 10 secs a/c never gets cold i just filled it with feron and used...


Just to make sure you have the right reading, the low side should be 30psi to 50 psi and the high side should be 150psi to 200 psi, Any other readings will give you poor a/c performance and if it's to high your going to have system damage. The other thing to is your a/c pressure switch may be bad and that's along the low pressure hose or on the accumulator (Air Dryer) It looks like a oil pressure switch with two wires clipped on to it. If that has gone bad it will give you the same on, off or stay off all the time. You can un clip the wire from the pressure switch and jump it and see if the compressor stay's on, if it does. Replace the switch and you can do it fast enough that you won't loose that much R134a. If your still having the on, off with the jumper wire to the pressure switch, replace the a/c relay. Good luck and hope this helps, keep me posted, be glad to get you running cool again.

Jun 24, 2009 | 2005 Chevrolet Cobalt

2 Answers

AC Wont charge after replacing components


whenever the ac system has been opened it should be hooked up to a vacuum pump designed to evacuate the ac system of any foreign debris and oil etc and after should be able to hold a vacuum to show that there are in fact no leaks then if all is ok at this point you can then charge your ac with the proper freon specified for you car when the pressure reaches satisfactory level the ac compressor will then cycle on you should not bypass the low pressure switch

May 30, 2009 | 1999 Chrysler Town & Country

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