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.

2002 BLK GT · 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

2002 BLK GT · 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 iTrader: 0 reviews	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, 01:42 PM	#4
mustanginky MM Fanatic 2000 gt Join Date: Feb 2009 Location: La grange, KY Posts: 3,982 iTrader: 2 reviews	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, built motor, blower cams, speedy dyno tune 412 hp, 450 rw tq HARDCORE CREW BRIGHT ATLANTIC BLUE CREW #1 MEMBER

July 2nd, 2009, 12:09 PM	#3
atc31510 Newbie Join Date: Sep 2007 Posts: 5 iTrader: 0 reviews	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 iTrader: 0 reviews	Thanks I will give it a try.

July 3rd, 2009, 12:02 AM	#6
2002 BLK GT Hardcore Enthusiast 4.6L Coupe' 5spd *************** Join Date: Apr 2009 Location: S. California Posts: 2,185 iTrader: 0 reviews	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...

July 6th, 2009, 10:19 AM	#7
atc31510 Newbie Join Date: Sep 2007 Posts: 5 iTrader: 0 reviews	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, 05:55 PM	#8
2002 BLK GT Hardcore Enthusiast 4.6L Coupe' 5spd *************** Join Date: Apr 2009 Location: S. California Posts: 2,185 iTrader: 0 reviews	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.....

July 6th, 2009, 06:22 PM	#9
Graypony Regular Join Date: Apr 2009 Location: NJ Posts: 132 iTrader: 0 reviews	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 iTrader: 0 reviews	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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