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High pressure no switching

Kicking off

Posted by Anonymous on

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: would a pressure switch keep the pump from kicking on

there might be a leak in the system

Posted on May 17, 2012

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Whenever I put on my a.c. the compressor keep tripping off every 5 seconds what is the cause


One of your limit switches are kicking it out. Either your are low on refrigerant and the low pressure switch is kicking out or there is a blockage in the system and the high pressure switch is kicking out. You will need to hook a set of gauges to find the issue.

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A/C just quit running compressor not kicking in - wondering if it is the relay switch? Where might that be located? Any other suggestions?


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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)
The powertrain control module (PCM) or engine control module (ECM) monitors the high side refrigerant pressure via a A/C refrigerant pressure sensor. When the pressure is high the signal voltage is high. When the pressure is low the signal voltage is low. When pressure is too high the PCM will not allow the A/C compressor clutch to engage.

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:
• The A/C high side line pressure is over 2957 kPa (429 psi).
• 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).
• Ambient air temperature is less than 5°C (40°F).
• Engine is idling at a low unstable RPM
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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2006 ford taurus high pressure switch has 4 wires-i want to know what and how this switch works.


works like a trinary,,,it most likeey operates the cooling fans and acts as a high side cutt out for the compressor(if high side reaches a pressure thats to high it will cutt off the ac compressor to prevent damage) SOME OF THESE SWITCHES WILL EVEN LET THE COOLING FAN KNOW TO KICK IN HIGH.

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1 Answer

99 suburban air not cold at all I don't see compressor clutch kick in all fuses are good


Try unplugging the pressure switch and jumping it with a wire. Either the high pressure or low pressure switch with make the compressor not turn on if bad. If the compressor kicks on, then check the pressure in the system. If the system is low on freon, have it repaired and all should be ok. If the freon level is ok, replace the pressure switch.

Hope this helps,

Jeff

Jun 24, 2009 | Dometic Rooftop RV Air Conditioner

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