AC Help

atc31510 · July 2nd, 2009, 11:58 AM

First of all this site rocks and is full of good info.Newbie here with a AC question.My AC all of a sudden just stopped working.I can run a wire from the battery to the compressor and it will come on and cool.Could it be the Ac Cycle Switch not giving power to the compressor? Or where do I need to start? Thanks for any help

Cricket · July 2nd, 2009, 12:02 PM

Check the wires to start, do a continuity test with a multimeter, check fuses, everything electrical related. Even if it seems 100% not it check it anyways.

atc31510 · July 2nd, 2009, 12:09 PM

I will check the wires tonight as for the fuses they all check out good.Thanks for the reply.

mustanginky · July 2nd, 2009, 01:42 PM

it's the low pressure switch. it's on the drier up by the firewall on the passenger side. it's a little plug that does into a schrader valve on top of the drier. un hook it and run wires from one side to the other. see if it gets cold then. if it does, then replace. it's a common issue

atc31510 · July 2nd, 2009, 02:50 PM

Thanks I will give it a try.

Big Daddys Stang · July 3rd, 2009, 12:02 AM

Yeah, I'm pretty sure its want ginky said, I also have that problem and that's what they told me. I just snap that box with my hand and then it works try that but don't hit it too hard...

atc31510 · July 6th, 2009, 10:19 AM

No luck with the ac cycle switch put in a new one no ac.I checked to see if I am getting power to the compressor and it show 13.xx volts till I plug up the wire then it drops to nothing. Could it be the relay box that is in the passenger side fender? I am not sure of the correct name. Thanks

Big Daddys Stang · July 6th, 2009, 05:55 PM

Did you try hitting it? that's what I what I thought gunky said yes thats a 10 dollar part... Just go to autozone they will know the name.....

Graypony · July 6th, 2009, 06:22 PM

Could be your system is low on charge. There are high and low pressure switches that control the compressor to protect the system should pressure be too high or low. If you jump the low pressure switch and the compressor starts the system needs an evac and recharge. On the high pressure side could be a clogged receiver drier or pinched hose if jumping the high pressure swich starts the compressor.

atc31510 · July 7th, 2009, 09:04 AM

I jumped both high and low switches and nothing .If I run a wire from the battery to the clutch it will come on and cool. Checked coolant level while I had compressor on and it is good.

July 2nd, 2009, 11:58 AM	#1
atc31510 Newbie Join Date: Sep 2007 Posts: 5	AC Help First of all this site rocks and is full of good info.Newbie here with a AC question.My AC all of a sudden just stopped working.I can run a wire from the battery to the compressor and it will come on and cool.Could it be the Ac Cycle Switch not giving power to the compressor? Or where do I need to start? Thanks for any help

July 2nd, 2009, 12:02 PM	#2
Cricket Air Embolism Assassin 2004 Cobra #2260/3768 Join Date: Sep 2005 Location: Chesapeake Posts: 6,364	Check the wires to start, do a continuity test with a multimeter, check fuses, everything electrical related. Even if it seems 100% not it check it anyways. __________________ MM Cobra Club #18 Bubba is my hero

July 2nd, 2009, 01:42 PM	#4
mustanginky Enthusiast 2000 gt Join Date: Feb 2009 Location: La grange, KY Posts: 963	it's the low pressure switch. it's on the drier up by the firewall on the passenger side. it's a little plug that does into a schrader valve on top of the drier. un hook it and run wires from one side to the other. see if it gets cold then. if it does, then replace. it's a common issue __________________ Procharged 2000 5 Speed BAB GT, 7.3 lbs, 368 hp, 406 rwtq. HARDCORE CREW

July 3rd, 2009, 12:02 AM	#6
Big Daddys Stang Hardcore Enthusiast 2000 V6 Join Date: Apr 2009 Location: San Diego, CA Posts: 1,904	Yeah, I'm pretty sure its want ginky said, I also have that problem and that's what they told me. I just snap that box with my hand and then it works try that but don't hit it too hard... __________________ *~For Newbies:* Rep are those little green squares, to give reputation click the gray scale, under the person you want to rep, then write why & name. Looking & buying soon a 01-04 Mustang GT

July 6th, 2009, 05:55 PM	#8
Big Daddys Stang Hardcore Enthusiast 2000 V6 Join Date: Apr 2009 Location: San Diego, CA Posts: 1,904	Did you try hitting it? that's what I what I thought gunky said yes thats a 10 dollar part... Just go to autozone they will know the name..... __________________ *~For Newbies:* Rep are those little green squares, to give reputation click the gray scale, under the person you want to rep, then write why & name. Looking & buying soon a 01-04 Mustang GT

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July 2nd, 2009, 12:09 PM	#3
atc31510 Newbie Join Date: Sep 2007 Posts: 5	I will check the wires tonight as for the fuses they all check out good.Thanks for the reply.

July 2nd, 2009, 02:50 PM	#5
atc31510 Newbie Join Date: Sep 2007 Posts: 5	Thanks I will give it a try.

July 6th, 2009, 10:19 AM	#7
atc31510 Newbie Join Date: Sep 2007 Posts: 5	No luck with the ac cycle switch put in a new one no ac.I checked to see if I am getting power to the compressor and it show 13.xx volts till I plug up the wire then it drops to nothing. Could it be the relay box that is in the passenger side fender? I am not sure of the correct name. Thanks

July 6th, 2009, 06:22 PM	#9
Graypony Newbie Join Date: Apr 2009 Location: NJ Posts: 29	Could be your system is low on charge. There are high and low pressure switches that control the compressor to protect the system should pressure be too high or low. If you jump the low pressure switch and the compressor starts the system needs an evac and recharge. On the high pressure side could be a clogged receiver drier or pinched hose if jumping the high pressure swich starts the compressor.

July 7th, 2009, 09:04 AM	#10
atc31510 Newbie Join Date: Sep 2007 Posts: 5	I jumped both high and low switches and nothing .If I run a wire from the battery to the clutch it will come on and cool. Checked coolant level while I had compressor on and it is good.

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