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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  • Ford Master
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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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  • Master
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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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Action Taken When the DTC Sets
The malfunction indicator lamp (MIL) will not illuminate.
Diagnostic Aids
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.
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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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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.

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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.

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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,...


Jonathon,
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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