Question about 1998 Ford Escort

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My escorts A/C clutch does not engage and when I hooked up the refrigerant can the low side pressure showed 100 psi.What could be wrong?

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About 5 bar pressure when running on the low side is sort of right ,100 bar or so on the high pressure.take it to a specialist shop that has the correct machinery to remove the gas weigh it then oil recovery and a vacumn add oil and then regas by weight ,your fault could be anything from a clutch to a faulty switch These cans are prohibited here in spain as being too dangerous,also the asociation of technical engineers has pressed for their withdrawal from sale because they can be used by in- experianced people which reduces the work being brought to the garages and us engineers pay our contributions to the society to protect our interests ,

Posted on May 27, 2010

  • jlagin22 Jun 01, 2010

    It was actually what others were saying the most common problem was. I found a solution after posting my question. It ended up being a soldering connection on the ccrm. I fixed the conection and no problems. I appreciate your response though. Thanks.


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Did it start and then quit? 100lbs is way too high for the low side pressure

Posted on May 27, 2010

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My 2004 chevy 1500 v8 air compressor will not kick in. I have jumped the low pressure switch and the compressor will not come on. i have changed the temperature controller and still won't kick in. i...

If the compressor kick's in when you jumper the relay socket there is no problem with the electrical to the compressor an the compressor isn't locked up . You have a control side problem , the PCM - engine computer is suppose to energize the relay if no other problems are present . The proper way to check this would be to hook up a scan tool an check pressure input's to the PCM an is the PCM getting a request from the HVAC control panel to turn on the A/C compressor . AutoZone is wrong as usual , There can be codes without the check engine light being on . o'reilly's is wrong as well DTC P0530 (LU3, LR4, LM7, LQ4 and L18)
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Action Taken When the DTC Sets
The malfunction indicator lamp (MIL) will not illuminate.
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The air conditioning (A/C) compressor clutch will not engage under the following conditions:
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• The A/C low side line pressure is under 138-172 kPa (20-25 psi).
• Throttle angle is at 100 percent.
• Engine speed is more than 5500 RPM.
• Engine coolant temperature (ECT) is more than 121°C (250°F).
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Compressor clutch engagement cannot be used to determine status of the low pressure switch. The low pressure switch is one of several inputs to the HVAC control module for A/C request authorization. A/C request is one of several inputs to the powertrain control module (PCM) that control A/C compressor clutch engagement.
To accurately determine what pressure the A/C low pressure switch opens and closes at use Kent Moore GE-47742 which will allow the technician to measure the switch point pressure at the switch.
Using a scan tool, monitor the "low pressure switch" status while monitoring the "low side" pressure at the switch to determine the switch points of the low pressure switch.
The low pressure switch "connector seal" must be removed before plugging it into the switch for testing. The "plunger effect" of plugging the connector with seal into the switch induces a pressure on the back side of the switch, this pressure will skew the opening/closing characteristics of the switch 5-10 psi until the pressure bleeds off. The time required for the connection induced pressure to bleed off can take 20 minutes or longer

Do you have the proper diagnostic tools ? Factory scan tool , A/C gauges ? You best bet , take your vehicle to a qualified repair shop !!

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Where is the ac lowside port located on a 2005 gmc savanna van

The low side port of the 2005 GMC savanna Van is located on the low pressure side of the compressor.

This is found by locating the compressor driven by a belt that has a clutch that engages and disengages as the a/c cycles.

The low pressure piping is always in the larger diameter piping, and the high pressure side is always contained in the smaller diameter piping.

Therefore, follow the thick pipes from the compressor up to the accumulator, which looks like a large can of soup. On the accumulator receiver/drier is a port that connects to the tube that is connected to the can of r134a freon refrigerant.

Simply quick connect the tube to the low side port, which is located on the 'thick' tubing or on the accumulator and then fill until the low side pressure is 25 psi to 45 psi while the compressor is running.

When the car is off and the compressor is not running, the pressure should be 75 psi to 100 psi on a hot day.

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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.

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I believe the 1984 Honda originally had r-12 which is largely illegal in the U.S. nowadays in that a certified mechanic must recover and recycle that kind of refrigerant.

I would recommend that you convert it to r134a if you can afford to do this, by putting new fittings on for a quick connect on the low side.

Add about 2 or 3 cans down at the compressor's low side (low pressure) which has larger pipes than the high side (high pressure).

Charge until the hose says you have 25 psi to 45 psi on the low side while the compressor clutch is turning.

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Compressor clutch does not engage--100 psi in system-

The compressor will not run without a minimum amount of R-134A. In some cases the compressor will shut itself down and require a reset (disconnect neg battery cable for 20min) prior to adding refrigerant. Best of luck with your AC issue.

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A/c blows out hot air, and when i hooked up a can of a/c charger the gauge on the can was in the red, saying i need professional help any ideas as to what the problem is? im hoping its not the compressor,...

I am amazed at some of the answers you have received so far. Let's get a few things straight, first, if your car is a 2006 model sold in the USA, you have an R134a system (mandated by federal law since 1996), so the answers that included mixing refrigerants are of no value. Second, if your system was working last year and you have not added any refrigerant since then, there is no way for your system to be overcharged. Assuming you are speaking of pressure in PSI and temp in degrees Fahrenheit, you are describing the static pressure in most R134a systems. By static I mean the pressure with the compressor not running. At 100 PSI of static pressure, your system is probably undercharged. You may have turned on your AC system inside, however you did not state that you can see the AC compressor clutch actually engaging and turning the compressor. Modern AC systems have low pressure cut out switches that will prevent the system from operating under low pressure conditions to protect the compressor. If you can observe the compressor clutch, watch to see if it is engaging and turning the compressor. If not, you have to make a small jumper (I use a small paper clip) to jump the low pressure switch plug (usually located on the compressor or accumulator) and spin the compressor. If that woks take another reading with your pressure gauge and I think you will find a reading somewhere below 30 PSI. You can then charge your system until you obtain a proper charge. Be sure to re-install the low pressure switch plug when finished.
If your AC compressor clutch is engaging and turning the compressor and your low side pressure is 100-150 PSI, then you do actually have a problem that will require professional assistance. Your compressor is either not functioning properly or there is some obstruction in your system that is preventing the refrigerant from circulating properly. Good luck.

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