Question about 2003 Chevrolet Impala

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A/c compressor continues to cut off/on.Full of

A/c compressor continues to cut off/on.Full of freon,changed hi/low pressure switch. But gets cold when does come on.

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What are the pressures HIGH and LOW.. if the orifice tube is restricted the low side will be too low and the switch will turn the compressor off/on..... if the pressures are OK and the comp goes off/on, then either the switch is bad or there is a bad connection at switch. pressures must be known to diagnose further.

Posted on Sep 24, 2009

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So, basically the compressor still WORKS, but it cuts off and on? they cut off and on alot anyways, but i would say, if it works, you shouldnt have anything to worry about, unless its doing it at ridiculous intervals....in which case you'll want to take it to an AC repair shop, and have the system checked for leaks, and possibly have the system evacuated and flushed.....there might be a valve that is stuck, which would cause the compressor to act erratic, otherwise your drier or evaperator could be clogged.

Posted on Sep 24, 2009

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1 Answer

Switch interruptor


If we are talking about a pressure switch, it usually is the low pressure cut-off switch. Before messing with this switch, verify what your Freon pressure is.
If the pressure is low, the low pressure switch may be fine and you need to add Freon and find out why the Freon escaped.
If you have high pressure, there is a second switch which cuts power to the compressor. Too much Freon will activate this switch.
Tip: You have both a high and low pressure switch. The proper amount of Freon will center the pressure and keep the compressor running more consistently.
Either pressure switch unscrews from the fitting and with a minimum of pressure can be removed from the lines and replaced. The housing should have shapes for wrenches.

May 12, 2013 | 1997 Ford Ranger SuperCab

1 Answer

My compresor dont want to kikin


Which compressor are you talking about? The air ride or the A/C?

For the air ride, it has fuses and relays. All the door jam switches and cargo doors must be shut.

For the A/C, you would verify that the system has Freon before attempting to replace a compressor. A low pressure switch would deactivate the compressor clutch. The system would need to be Evacuated with a Vacuum pump and then recharged, It is not like changing a starter. After prepping the system, you may need to jump the low pressure switch to get an initial charge of Freon, then reconnect the low pressure harness to the cut-out switch.

You need some type of guage to measure the charge. When the system has enough Freon to let the Low pressure switch provide power to the compressor clutch; the signal will be restored to the compressor.

Mar 16, 2013 | 2004 Ford Expedition

1 Answer

Tracer air conditioner blows cool only sometimes


It is very possible that the A/C is not engaging part of the time. It can be overcharged. You have 2 safety switches on the A/C system. A high pressure and a Low pressure.

Pressure inside the system is dependent on the background temperature where the car sits. This means the A/C does not have to be turned on for the switches to activate. Their job is to cut off power to the compressor, so when you start your car, the power to the compressor may already be switched off.

There are charts for filling the Freon system. For sake of conversation, lets' say the low pressure cuts off at 20psi and the high at 300psi. Those are the ratings for the respective switches. You have a low charge, say 25psi at 80 degrees outside temp. Overnight or a Cold front comes in and the outside temp is 70 degrees. The system drops to 19psi as the car sits. The compressor clutch will not get power. Also for the high switch, the car sits as outside temp goes to 100 degrees. The A/C pressure climbs to 325psi as the Freon expands, the compressor clutch will not get power.

This is why many instructions tell you to bypass the pressure switches to charge the system. Your switches are constantly working to keep the pressure between 30psi and 300psi. MODERATION is key here. The longer the compressor clutch stays engaged, the more cooling you will have.

So the car makers recommend a fixed amount of Freon for each Model of car. Volume capacity is different for the length of the hoses, the size of the condenser, the chamber inside the compressor. It all is calculated so they know how many LBs of Freon will fit in the space to produce a given pressure.

Most of the pressure switches can be changed without significant loss of Freon, just a puff when the switch is removed and replaced. I have replaced more low pressure switches than the highpressure. It is probably because the springs are much weaker on the low side.

Some major autoparts stores have tool loaner programs. Manifold gauges are used to read both pressure ranges. If you did not purge the system with an electric or air powered Vacuum pump, you may have water condensation forming ice in the lines.

I hope my solution helps you.

Sep 07, 2012 | 1993 Mercury Tracer

1 Answer

AC not running in my 1998 Jeep Cherokee. Changed AC clutch compressor RELAY, freon level is good, temperature sending unit replaced along with cooling fan! Checked all fuses still good. Can't seem to...


Hello, You have two switches which work off the pressure of the Freon. Both of these switches cut off the power to the compressor. One is for HIGH pressure and the other is for LOW pressure. Check for power at the compressor clutch connector harness while the controls are set and the engine is running. You may have power and a bad clutch.

When you say that the Freon pressure is good, does that mean the pressure is within the proper range? Too much Freon will make the HIGH switch cut off power and too little will make the LOW pressure switch cut off power.

The ideal amount(ozs) of Freon is what is recommended by the Manufactuer and it will provide a moderate amount of pressure of about 35psi-40psi. You can borrow pressure gauges, called Manifold gauges to measure your system at autoparts stores with loaner programs.

The low pressure side of the system is the one you use to induce the Freon to go into an empty system. You can bypass this switch by taking off the connector and putting a "U" shaped jumper into the harness and the compressor clutch should get power to LOCK up all of the time.

You can take off the switch connector at the compressor clutch and then check for power when bypassing the HIGH pressure switch if the LOW pressure switch does not make the system get power. Only, really only bypass the HIGH pressure switch with the clutch connector disconnected. The HIGH switch is there to prevent damage to all of the components from seals to lines to every piece of Freon hardware in the car. Bypassing with the A/C clutch disconnected will allow you to know if power is getting to the compressor clutch.

Finally, you can get FREE wiring and fusebox diagrams through Autozone.com. Just sign and register to their site and then you can print the documents for yourself.

Good luck with this repair and I hope my solution helps you.

Mar 19, 2012 | 1998 Jeep Cherokee

1 Answer

My ac is blowing hot air. I've checked the gas and it's full. The compressor seems to cut on and off about every 10-15 sec. Do I need a new compressor or do I have some sort of fault switch? Any...


Hello, You need to check how much Low end pressure you have. The Low pressure cutoff switch will disconnect the compressor if the pressure is too low. The high end pressure switch will do the same thing for extreme pressure.

Sometimes the Low pressure switch will get weak and cut off the system too early. Just change this switch which will come out with only a slight puff of Freon being lost. You can jump the connector with a U shaped wire and bypass the Low pressure cutoff switch. If the compressor works better and does not cut out, it can still be low on Freon or have a bad Low pressure switch.

However, if the compressor cuts out a Second time with the Low pressure switch bypassed, the system is probably overcharged and the HIGH pressure switch is cutting off the compressor. You need to purge some Freon out of the system if High pressure is indicated.

Where it gets tricky is the Compressor will compress both Freon and Atmospheric air. Your efficency drops when the Freon is displaced by Atmospheric air. You will need to find the leak in the system which is allowing Freon to leak and outside air to enter the system. You will get a pressure reading with any gas in the lines.

There are Leak detectors and sealers for the system. I hope you just have a bad low pressure switch which is the easiest solution.

Jun 25, 2011 | Ford F-150 Cars & Trucks

4 Answers

A/C is blowing hot air. Freon is full, compressor


Not sure how you know if the freon is full without the unit running. There are a number of switches which can keep your A/C from coming on. There is a low pressure switch which is usually located on the larger line and sometimes located on a silver cannister (called an accumulator) which is the low side of a compressor circuit. There is also a high pressure cutout which is usually located on the back of the compressor unit. Both of these switches can be jumpered out to see if they are the reason for the compressor not working. You remove the two wire connector to either switch and place a small jumper wire between the two wires on the connector block. The other reason my be a low idle cutout switch and this will also usually be located near on on the compressor. You can also test it the same way as the other switches. If it is the low pressure switch then of course you will need to add freon which you can purchase from any auto parts store. They usually come with instructions and all the equipment needed to add in freon. If it is high pressure, then some of the freon should be recovered from the system by a technician. If is the low idle cutout then you will have to take it to a mechanic to understand why it is idling so low. Hope this helps.

Jul 16, 2010 | 2004 Kia Sedona

1 Answer

Air conditioner starts blowing cold air then blows warm


This is most likely the cycling of the AC unit. As the compressor pressurizes the 134a Freon you get the cold air, once it reaches a certain pressure it cuts out. If you are low on Freon it will cycle out more often. Check your freon level with a gauge to see if your within the proper tolerance. If the compressor runs for a period and doesn't reach the right pressure it will cut out to keep from damaging your compressor so it is important to keep the correct amount of freon in the system.

Jun 21, 2010 | 2002 Dodge Stratus

2 Answers

I have a 1996 geo tracker I cant get the compressor to run I have relpaced the compressor relay which dosent help. freon is ok compressor cluch kicks in when direct wired.


does the compressor run when bypass the compressor thermal cutout switch on the compressor? here is the part number and a picture.
also does it run when u bypass/jump the compressor cycling switch? it is located in the low side of the sytem, thios is the line that is the larger of the two, hwere is the part # and picture.

1. compressure cutout switch (3 diff ones used)
FOUR SEASONS Part # 35756
Compressor Mounted Cut-Out Switch; 1 Term White
type two
FOUR SEASONS Part # 35973
Compressor Mounted Cut-Out Switch; 2 Term; Blue or Green; Low Pressure
type 3
FOUR SEASONS Part # 35970
Compressor Mounted Cut-Out Switch; 2 Term; Yellow

d2d2a20.jpgthis is type one and two, two wires.

next is type 3 one wire.
06d325f.jpg Next is the low side compressor cycling switch, most common problem.

ACDELCO Part # 155606 {#96069320}
SWITCH,A/C CYCLING

2c15c22.jpg

Nov 02, 2009 | 1996 Geo Tracker 2 Door

2 Answers

96 Tahoe no Cold Air


YOU NEED 28 PSI ON LOW SIDE AND ABOUT 190 ON HIGH SIDE.YOUR REFRIGERANT IS LOW THAT WHY COMPRESSOR CYCLING ON AND OFF.

Jul 22, 2009 | 1996 Chevrolet Tahoe

3 Answers

Trying to add freon to my 99 gmc sierra, as i add freon i hear the compressor start to come on but turns off after a few seconds,still dosnt get cold


The compressor cutting and out is a good sign that the system is trying to work. Usually when the compressor cuts in and out after a few seconds, it means that the system is not fully charged and more refrigerant is needed. It's a good idea to purchase a gauge that measures the amount of charge in the system. The gauge looks like an air gauge, and they are not very expensive. That way you will know how much more of a charge the system needs. The gauge hooks up to the low pressure valve, just as the charge hose does.

Jul 02, 2009 | 1999 Chevrolet Silverado 1500

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