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Air condition compressor will not come on what could cause have checked low and high pressure switches

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If the A/C compressor does not come on, the compressor clutch is not getting power or the freon level is too low. Reasons for no power include blown A/C fuse, bad switch on console, bad solenoid on compressor. I would check the fuse first. If that's ok, next check for power at the compressor with a test light or volt meter. Next, try to jump power to the solenoid to get it to pull in. Do yourself a favor, and get a schematic for the car. It will make it easier to trace out the wires and find the problem. You can check out repair manuals from the library and copy the schematic from the manual.

Posted on Sep 06, 2010

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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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I WOULD LIKE A WIRING DIAGRAM FOR A VDJ76R LANDCRUISER AIR CONDITIONING CIRCUIT, NO POWER TO COMPRESSOR, IF POWERED UP A/C WORKS FINE.


by passing the pressure switches to check the compressor reveals nothing. There are 2 pressure switches in he system
one is for low pressure --when the gas is too low and the other is for when the pressure is too high--blockage in the system or condenser fan not working if the system is a climate control unit then check the control module for correct operatyion

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POSIBLE LOW IN FREON OR YOU HAVE A ELECTRICAL PROBLEM

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check the refrigerant level. The compressor is running until the low pressure or high pressure switch switch cuts it off.

Running the unit without enough refrigerant will damage the compressor because the lubricating oil is dissolved in the refrigerant. This is the reason for the low pressure switch cut off--to protect the compressor from damage.

If pressure gets too high, the compressor seals will blow. Thus the reason for the high pressure switch. Too much refrigerant or too much air in the system (due to a leak) will cause high pressures.

If refrigerant level appears to be correct, then suspect trapped air from a leak causing a high pressure cut-off. If refrigerant is low, suspect a leak causing a low pressure cut-off.

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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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1 Answer

My air condition is not blowing cold air


best diagnostic method is dual head gauges. balanced pressure between low and high side in the off position is aroung 90 lbs. running low pressure is 20-40 lbs and high pressure 160-200, is the compressior not coming on? does it stay on, or click on and off. either might mean the freon level is low. try unplugging the low pressure switch on the low side supply line and shorting the pigtail wires together with a paper clip. does the compressor stay on now? if so and the air is warm or cool, freon is low. if the air is cold that switch is bad. if compressor still won't come on the list of possibilities grows longer: compressor, comp fan clutch, AC relay, restriction at several places... repair shop time...

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1 Answer

Air conditioning comp not turn on


if you used a pressure washer ,you could have caused a leak ,if there is no freon the low pressure switch wont let the compressor turn on,even if you didnt use high pressure,engine degreaser may remove corrosion on the line set or the condenser ,also causing a leak, the high or low pressure switches may still be wet, follow the line set ,fat line (low pressure switch with a plug w/2 wires)unplug it make sure its not still wet inside,do the same to the high pressure switch on the small line,check the fuses ,pull the ac relay make sure there is no water underneath,and the prongs are dry,if the blower fan in the vechile isnt working on 2,3,or 4 speed it wont let the ac turn on,if all that checks out ,turn the fan on high max ac unplug the green wires or wire on the compressor right behind the belt pulley,check for 12v dc,if none,you lost a relay or one of the pressure switches,fuse,maybe broken wire,if 12 v. is there,your clutch coil fried on the compressor pulley,good luck, hope you figure it out

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2 Answers

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I'm not absolutely sure on this one, but many compressors have a low pressure and a high pressure cut off switch. The low pressure switch monitors to make sure there is enough refrigerant in the system. Too low and it cuts off because otherwise your system will ice up (go figure that one out!) The high pressure switch is there to protect from clogs in the system causing damage to the compressor or other system components.

You should have a qualified professional check the system and both of those sensors. You most likely have a clog in the system which can be caused by a broken desiccant bag or a compressor that is beginning to self destruct and some piece of metal is clogging the system in a hose or at the orifice tube.

In any case you need professional help here...

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1 Answer

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Check the cooling system, particularly the radiator to make sure it is not partially plugged. Additionally, check the radiator fan for proper operation. If the engine temperature is running way above normal, some of the heat is transferred to the air-conditioning condenser, which causes the air-conditioner to lose efficiency. As for your question about a "limiter" switch, there is a high-pressure switch in the air-conditioning system that cuts the compressor out when the pressure gets too high.

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