Question about Chrysler Concorde

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Where is the low side pressure switch located for a 1993 chrysler concorde. Trying to engage the compressor clutch to fill with freon

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If you fill it with freaon after evacuation the first charge at the pressure of the can is enought to close the switch if not theres a leak or something eles is wrong, The low side switch being crossed will speed things up but is'nt recomended as the freaon can freeze up as it forced charged and overpressure and hose or condender failure is'nt worth the faster speed of charging. A freaon charging station will fully charge the system without even starting the car.

Posted on Apr 03, 2011

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Posted on Jan 02, 2017

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3.8 liter replaced a/c compressor 2years ago this year compressor clutch not engaging has freon could it be low pressure switch is bad?


Has Freon? How much Freon? The low pressure switch has a threshold and you need to use a gage to see what it is. You can bypass the low switch to see if the compressor clutch engages.

May 13, 2016 | 2008 Chrysler Pacifica

1 Answer

1989 s 10 blazer won't take freon has 55 psi on low side while filling with comp. On only 20 psi high side where should I look for prob.


Sounds like the fittings are reversed.
With the compressor running, the low side should drop below zero then climb to 60 or 80 psi as you add freon.
You would need to jumper the low pressure switch to engage the compressor clutch to add freon. The compressor must be running.

Mar 22, 2015 | Cars & Trucks

1 Answer

I am trying to troubleshoot my 2002 saturn l200. My AC is not working. The button light comes on, but I feel the compressor not coming on. I check the fuse and it's ok?


most likely you are low on freon and the pressure switch will not allow the compressor clutch to engage. one way to tell if that is what is happening is to find the pressure switch located on the low pressure side of the system. you can tell witch line is the low pressure side because it is larger in diameter than the high side.Then take a wire and jump the two wires that go to the switch together.If the compressor starts to run then charge the system with freon.If it does not run then check the relay.

May 05, 2014 | Saturn L-Series Cars & Trucks

2 Answers

Ac compressor cycling with no cool air blowing inside


Depending on how much freon is in the system, it could be a faulty low pressure switch or a faulty clutch.
You would jumper the low pressure switch to eliminate it for a test.

Jun 08, 2013 | Cars & Trucks

1 Answer

Compressor isnt turning at all dont know if i need new one or if i need new clutch how can i tell


The pulley on the compressor is always running when your engine is running, but the only time
it compresses the freon is when the clutch engages, if the compressor's pulley was not turning,
it would have already snapped a fan belt or your serpentine belt. voltage runs from your fuse box
thru your air condition switch on your dashboard to a low pressure switch that is located at the
accumulator a long cylinder,close to the firewall under the hood or close to the condensor, front
of the car. the switch detects freon pressure in the accumulator, if there is freon pressure, the switch
will stay closed and allow voltage to go to the compressor clutch to engage it and compress the freon,
if there is no freon pressure the switch will open, and there will be no voltage to air compressor, its a
saftey switch to keep your compressor from getting damaged.its possible that the switch could be bad
it may not have voltage at the switch, or it may be open because there is insufficient freon pressure.
check and make sure there is freon in the system.check for voltage at the low pressure switch if you have freon in your system and voltage at the pressure switch, set your ac on high, pull the molex off
the switch, and jump it out with a jumper wire, if the clutch engages and your car starts to cool, just
replace the switch. if the clutch engages but does not cool, then your ac system has some blockage
in the lines. if the clutch does not engage at all then it would be the compressor clutch. good luck!

Aug 03, 2011 | Buick Century Cars & Trucks

1 Answer

Got a 1999 Buick Century, AC stopped working so I filled up the FreOn and it didn't make a difference. Checked all Fuze's and Relays (to the best of my ability) still no change. There are no knobs, it...


Can't see filling with freon without compressor turning. Put jumper wire on high/low pressure switch harness to see if clutch engages. If so, bad high/low switch. If not,check power to high/low harness via fuse,relay, or dash control.Battery voltage applied to compressor if accessible will also engage compressor clutch and read your low side with your fill gauge. 30-35lbs is good

Aug 12, 2010 | Buick Century Cars & Trucks

2 Answers

A/c has full freon but the compressor clutch wont engage. i have found that the plug going into the compressor is not getting any power. what could be the problem?


On the low pressure line of the ac you have a pressure switch which allows the compressor to come on once a certain pressure is reached, and it will cut the compressor off if the pressure is too high or too low. Look at your ac hose and find the switch *you will see wires connected to it* you may need to replace this switch. You can use a test light to see if you are getting power to the switch. You should check you fuses, and the ac relay witch is usually in a black plastic box under the hood.

Aug 10, 2010 | 1997 Ford Crown Victoria

2 Answers

My 99 s10 blazer has ac problems. i tried to fill the refrigerant and the psi bounces between 55 and 20, it starts at 20 the builds to 55, then the clutch kicks on and the psi drops back dowm to 20. this...


I'm assuming that's the high side pressure reading. It sounds like you don't have enough refrigerant in there still. Depending on outside temperature the high should be around 130-150 and the low side between 25 - 30 or so with the compressor clutch engaged. Once you connect the can to the low side you'll have to start the car and turn the a/c on to get more in there until the pressure readings are correct.

Jun 21, 2010 | 1999 Chevrolet Blazer

1 Answer

Air Conditioniong not working


U may be low in Freon gas.
When Freon is low there's low pressure switch that will prevent A/C compressor clutch from engaging to protect it from failure.
So, first check Freon pressure & any leaks form lines & hoses fittings.
Even if the fan is working, that doesn’t indicate proper compressor OP'S.
Look at the compressor front side you'll see the clutch stationary while the AFT pulley moving.

Then put air-condition compressor switch to ON (Engage),
You should see the clutch engage & start rotate,
If NOT, this is very clear indication u r low in Freon.

Regards;
MAR

Jun 03, 2009 | 2003 Dodge Caravan

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