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Hi pressure on the low side. 130 psi static - Roadmaster Buick Cars & Trucks

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Either the system has been grossly overcharged or there is a restriction in the low side line such as a plugged fixed orifice. If the orifice is plugged the most likely source of the debris is a AC pump coming apart.

Posted on Aug 02, 2008

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Posted on Jan 02, 2017

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Ford Ranger a/c blowing hot air


You have the right port if it fits the RECHARGE hose. If it's reading 130 psi, it might be way overcharged.
Did you follow directions and did the AC compressor clutch kick in? At that pressure,on the low side,the compressor shouldn't even engage.
To discharge the system if overcharged,you need for a shop to do it. don-ohio (:^)

Mar 07, 2017 | Ford Ranger Cars & Trucks

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

When I push the air conditioning on button it will not stay on, it blinks & then goes off. The fan is working,


charge more 134A to the system or check the pressure of the low side if out side temperature is 80f pressure should be 40 to 55 psi if pressure is lower check hi side if pressure is over 200 psi the expancion valve is damage or got a problem in the evaporator the hi side work with a pressure from 140 to 180psi

May 24, 2011 | 2006 Chevrolet Impala

1 Answer

Need to fill air where is low pressure intake


The a/c has a low pressure port on the low pressure side of the a/c piping system.

One can identify the low side by looking at the 'thicker' pipes vs. the 'thinner' pipes on the high pressure side.

There may be a canister that has a low pressure port on it on the passenger side. Or else, it's on the thicker piping itself.

There may be a blue or black cap on the port.

The pressure should read 35psi to 45 psi on the low side when the a/c clutch is spinning or engaged.

When the a/c clutch is not spinning or engaged then the pressure should read 75 psi to 100 psi on a hot day.

Aug 06, 2010 | 1997 Pontiac Grand Am

1 Answer

2004 Honda CRV air conditioning stopped blowing cold air. Box Store Auto Repair place said it was the compressor cost $1000. A Motorhead friend said it was either the low pressure switch or the high...


Hi!

If by red lined you mean it went over the 250 psi range??

Assumiing that the answer is yes. This is what I think.

The Hi and Low pressure switches prevent damage to the compressor if the pressure is out of range.

Before going any further, check A/C Relay and fuse.

With the engine off, check pressure on both, Hi and Low. Both gauges must have same reading. It should be between 175-200 psi at about 80 degrees temp., if pressure is over that range, the Hi Pressure switch is preventing the compressor clutch to engage, gas needs to be removed by a qualifying A/C Technician.

If Pressre is between range, and both gauges read the same, start engine and turn compressor on, check gauges, The Low side should read about 38 psi and the Hi side should be between 250/275.psi.

Any more trouble shooting should be performed by a Qualified Tech.

Don't forget to rate this post!! Good Luck!!

Jul 20, 2010 | 2004 Honda CR-V

2 Answers

My 99 s10 blazer has ac problems. i tried to fill the refrigerant and the psi bounces between 55 and 20, it starts at 20 the builds to 55, then the clutch kicks on and the psi drops back dowm to 20. this...


I'm assuming that's the high side pressure reading. It sounds like you don't have enough refrigerant in there still. Depending on outside temperature the high should be around 130-150 and the low side between 25 - 30 or so with the compressor clutch engaged. Once you connect the can to the low side you'll have to start the car and turn the a/c on to get more in there until the pressure readings are correct.

Jun 21, 2010 | 1999 Chevrolet Blazer

1 Answer

AC comes on, then shuts down before car is cooled. Compressor activates and blows cool air for about 15 seconds then shuts down.


Low on R134a, you need to have the system recharged. Try to stay away from the do it your self kit that most Auto Parts store carry.
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.

http://www.freeautomechanic.com/airconditioning.html

Jun 12, 2010 | 1998 Cadillac Eldorado

1 Answer

What is the a/c operating pressure's of a 2001 expedition 4.6


Normally, when the AC compressor is engaged the low side should read between 25 and 50 psi. and the high side should read between 130 and 175 psi.

May 17, 2010 | 2001 Ford Expedition

1 Answer

The air conditioning blows only hot air


Is that your static pressure readings??? If that is your static pressure readings that's good. When the engine running and fan on high and a/c compressor clutch engaged you should have 25 to 35psi on your low side and 200 to 350psi on your high side. If the clutch is engaged and that is your readings, replace your a/c compressor. Keep me posted, be glad to help.

Jun 29, 2009 | 2003 BMW Z4

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