Question about 1993 Saturn SL1

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Air condition 95 SL1

What is highest PSI on low pressure side while air to get coldest air out of system was at 20 PSI charged to 30 PSI while running now system cools air but does not get as cold as it use to

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This is normal if the heat load (temperature inside the car) is not extreme (100+ degrees F). A slightly undercharged system will run colder when the weather is not to hot. However, an undercharged system will not perform as well when the temps go up, as there is not enough Freon to tranfer the massive heat load out of the cabin of the car.
One very simple thing that will help performance is the clean the A/C condenser (in front of the radiator). Even if it looks clean, debris builds up in the gap between the radiator and the condenser. Spray water from a garden hose into the front of the condenser. This works best with the engine running and the A/C on. 3-5 minutes will work. A nozzle to increase the outlet pressure of the hose helps. Spray ALL areas of the condenser.
Charlie

Posted on Jun 25, 2008

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2 Answers

2006 Ford Fusion Air Conditioning compressure not turning on.


Thats pretty high if the system is not running. Average pressure on the low and high side should be near outside air temp.
Normal low side is 30-40 psi and high side is 200-250 psi when the system is running and the freon charge is full.

Aug 28, 2012 | 2006 Ford Fusion

1 Answer

What is the high pressure reading for charging freon for the air condition?


For charging purposes, you really should be monitoring the low side pressure. Depending on ambient air temperature, the low side should be between 30 and 50 lbs PSI. The high side can be between 135 and 330 lbs PSI.

Sep 19, 2011 | 2006 Chevrolet Trailblazer

1 Answer

Low side pressure specs for 2003 silverado2500hd


Ambient Air Temperature
Relative Humidity
Service Port Pressure
Maximum Left Center Discharge Air Temperature
Low Side
High Side
13-16°C (55-65°F)
0-100%
150-246 kPa (22-36 psi)
730-1190 kPa (106-173 psi)
12°C (54°F)
19-24°C (66-75°F)
Below 40%
150-280 kPa (22-41 psi)
900-1390 kPa (131-202 psi)
14°C (57°F)
Above 40%
179-137 kPa (26-46 psi)
990-1500 kPa (144-218 psi)
16°C (61°F)
25-29°C (76-85°F)
Below 35%
218-328 kPa (32-48 psi)
1240-1640 kPa (180-238 psi)
17°C (63°F)
35-60%
236-342 kPa (34-50 psi)
1290-1680 kPa (187-244 psi)
18°C (64°F)
Above 60%
250-365 kPa (36-53 psi)
1340-1760 kPa (194-255 psi)
20°C (68°F)
30-35°C (86-95°F)
Below 30%
266-386 kPa (39-56 psi)
1500-1940 kPa (218-282 psi)
21°C (70°F)
30-50%
280-397 kPa (41-58 psi)
1540-1990 kPa (224-289 psi)
22°C (72°F)
Above 50%
300-430 kPa (44-62 psi)
1600-2070 kPa (232-300 psi)
24°C (75°F)
36-41°C (96-105°F)
Below 20%
328-439 kPa (48-64 psi)
1810-2240 kPa (263-325 psi)
25°C (77°F)
20-40%
337-457 kPa (49-66 psi)
1840-2290 kPa (267-332 psi)
26°C (79°F)
Above 40%
355-474 kPa (52-69 psi)
1890-2340 kPa (274-340 psi)
27°C (81°F)
42-46°C (106-115°F)
Below 20%
391-491 kPa (57-71 psi)
2130-2500 kPa (309-363 psi)
29°C (84°F)
Above 20%
397-508 kPa (58-74 psi)
2160-2550 kPa (313-370 psi)
30°C (86°F)
47-49°C (116-120°F)
Below 30%
451-552 kPa (65-80 psi)
2420-2790 kPa (351-405 psi)
33°C (92°F)

Jul 10, 2011 | 2003 Chevrolet Silverado 2500HD

2 Answers

What should the pressures on the low and high side of the air conditioner read ?


low side should be about 30 psi at idle speed, high side 120 to 180 psi depending on ambient temp. higher temp, = higher pressure, as you increase engine rpm to say 1000 low side should drop to 10 to 15 psi & high side should increase about 30 psi. If high side goes over 280- 300psi you have contamination (air) in system or over charged with refrigerant. you will need to recover freon, evacuate & recharge system with proper amount of refrigerant. If the low side drops below 0psi or into vacuum then the refrigerant level is low, you will have to check for leaks , repair leaks & refill refrigerant.
Hope this helps
Paul T

Jun 01, 2011 | 1997 Chevrolet Suburban

1 Answer

The car has been in the shop for a week. mechanic can not figure it out. AC runs fine at idol but when you drive it for about 20 minutes it will only blow hot air. When you stop and turnit off and wait...


If there is a restriction in the a/c system, the pressure may be getting either too low or too high for system to work properly.

Also, if the charge is low, the compressor may not turn on 20 minutes into your trip.

Check to see if the pressure on the low side is 25 psi to 45 psi when running the a/c.

Good luck.

Jul 05, 2010 | 2006 Volvo S40

2 Answers

I Have a 2000 Expedition 5.4, atempted to charge the ac. I was getting a preasure reading but no freon would go into the system. When the compesor cicks on i get a reading of about 30 psi when it goes off...


Add more freon, should have a low side reading at about 30-35psi at about 1500 rpm and stay there, if it drops low pressure switch will cut a/c compr. off.

Jun 10, 2010 | 2000 Ford Expedition

1 Answer

My husband is putting 134a in my air conditioning unit. can you give instructions


Recharge the system through the low side fitting, with the engine running you will need to have 25-30 psi on the low side gage, add freon a little at a time until this pressure is reached with the engine running and the compressor engaged.

May 29, 2010 | 2001 Ford Taurus

1 Answer

Re charge air conditioning in a Ford F150


The a/c requires r134a freon the low side fitting is on the a/c accumulator on the passenger sideof the engine compartment. Charge through the low side until the comp energizes and the low side pressure is around 25-30 psi ( with the comp on )

May 28, 2010 | 2004 Ford F150

1 Answer

Air condition blows hot air but it has freon


You may have created an over charged condition and at this point the a/c compressor will cut off on high head pressures. This can be verified by installing gauges to the systems high and low side service taps and reading the pressures.An overcharged system will start the compressor briefly but soon cuts off once pressure goes to 350 - 400 lbs on the high side. Acceptable pressures for this system should be no greater than 250 high and low suction should drop to 40-50 psi.You might recover the charge and evacuate the system,then try bringing the charge back to proper level.A sight glass in the reciever drier really helps determining proper fill.Once all bubbles have dissipated from the sight glass during charging ,one should stop at that point to avoid overfilling.Too much freon is worse than a low charge especially in hot ambient conditions....

Aug 26, 2009 | 2003 Saturn ION

1 Answer

2004 Dodge Ram 1500 QC 4x4


28 TO 30 PSI ON LOW SIDE. HIGH SIDE PRESSURE 190 TO 200 PSI.

Jul 26, 2009 | 2004 Dodge Ram 1500

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