So tell me, WHY THE HECK DOSEN'T MY A/C WORK????
#1
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Iam stumpped here people. iam thinking i have a cross between a mechanical problem and a wiring problem(both or one or the other).
heres the facts
-i didn't swap out the conditioner
-i did replace the condensor and lines from a junkyard car from a 300 of the same year.
-i replaced the ac condensor with a brand new unit(the one under the dash).
-iam using a soarer ecu on a sc400 swap if that matters
-i thought this was the recharge port and i used 1 full can of freon here along with half a can of red dye to check for leaks
![](http://i1062.photobucket.com/albums/t493/supersayianjim2/project%20scorer%202/usedthislowpointwrongoneperhaps_zps8eaeccb9.jpg)
-then i found this port never used it before.
![](http://i1062.photobucket.com/albums/t493/supersayianjim2/project%20scorer%202/justseenthislowpoint_zps798fbb8d.jpg)
-i tested the compress clutch and it does kick on when it gets power.
![](http://i1062.photobucket.com/albums/t493/supersayianjim2/project%20scorer%202/powerwiregoingtoaccompressor_zpsdfc63a4a.jpg)
-iam gettting 12 volts to my clutch control pin.(#5) from the engine side of the harness
![](http://i1062.photobucket.com/albums/t493/supersayianjim2/project%20scorer%202/acclutchwire_zps1c559739.jpg)
![](http://i1062.photobucket.com/albums/t493/supersayianjim2/project%20scorer%202/only2acpinsonthesoarerecu_zpsef46a261.jpg)
I brought the resistor that was mentioned on another thread on here
![](http://i1062.photobucket.com/albums/t493/supersayianjim2/project%20scorer%202/backofpackage_zpsd3789479.jpg)
When i ground the a/c clutch wire (#5) then the clutch kicks on.
![](http://i1062.photobucket.com/albums/t493/supersayianjim2/project%20scorer%202/groundeditgoingtotheharnessbingoclutchworks_zps5ebf1e01.jpg)
so iam stumpped, any takers here?? when i ground #20 wire(ground to the ecu pin) it appears my idle smooths out. iam thinking of using this a permanent ground.
heres the facts
-i didn't swap out the conditioner
-i did replace the condensor and lines from a junkyard car from a 300 of the same year.
-i replaced the ac condensor with a brand new unit(the one under the dash).
-iam using a soarer ecu on a sc400 swap if that matters
-i thought this was the recharge port and i used 1 full can of freon here along with half a can of red dye to check for leaks
![](http://i1062.photobucket.com/albums/t493/supersayianjim2/project%20scorer%202/usedthislowpointwrongoneperhaps_zps8eaeccb9.jpg)
-then i found this port never used it before.
![](http://i1062.photobucket.com/albums/t493/supersayianjim2/project%20scorer%202/justseenthislowpoint_zps798fbb8d.jpg)
-i tested the compress clutch and it does kick on when it gets power.
![](http://i1062.photobucket.com/albums/t493/supersayianjim2/project%20scorer%202/powerwiregoingtoaccompressor_zpsdfc63a4a.jpg)
-iam gettting 12 volts to my clutch control pin.(#5) from the engine side of the harness
![](http://i1062.photobucket.com/albums/t493/supersayianjim2/project%20scorer%202/acclutchwire_zps1c559739.jpg)
![](http://i1062.photobucket.com/albums/t493/supersayianjim2/project%20scorer%202/only2acpinsonthesoarerecu_zpsef46a261.jpg)
I brought the resistor that was mentioned on another thread on here
![](http://i1062.photobucket.com/albums/t493/supersayianjim2/project%20scorer%202/backofpackage_zpsd3789479.jpg)
When i ground the a/c clutch wire (#5) then the clutch kicks on.
![](http://i1062.photobucket.com/albums/t493/supersayianjim2/project%20scorer%202/groundeditgoingtotheharnessbingoclutchworks_zps5ebf1e01.jpg)
so iam stumpped, any takers here?? when i ground #20 wire(ground to the ecu pin) it appears my idle smooths out. iam thinking of using this a permanent ground.
#2
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The ecu sends a ground signal(acmg) to the a/c relay. That completes the circuit and allows the relay to send the 12v to turn on the clutch. Check to see if the ecu is sending a ground from the acmg pin on the ecu.
#4
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the clutch pin is the one he is talking about most likely that turns the compressor on. when the a/c is on the idle up also gets grounded so the iacv will idle up some, if you ground 20 without 5 you will probably get idle up and no a/c hence the smoothing out of your idle. sounds like its working if the compressor is coming on. what happens after it comes on, no cold air?
#7
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I just recently took my car to the shop as I'm not as well versed in the electrical aspects as you guys and after a whole lot of diagnostics they determined that I would need to replace my A/C ECM. Its not sending out the ground signal for the A/C relay. They attempted a bypass but it didn't work and the only other option they said would eventually melt the wire due to the increased volatge.
Not sure if that's the problem you're having, but I though my situation may help in some regard. Also, I have a question. If my IACV is unplugged and compensated for with my AEM EMS, could that affect the issue I am having with the A/C not working? It blows air but its not cold and has been recharged and determined to be holding pressure without evidence of leaking.
Any help would be appreciated. I'm trying to figure out if I should go ahead and find an A/C ECM unit to replace mine with or if the IACV being unplugged is ultimately the issue. Thanks in advance!
Not sure if that's the problem you're having, but I though my situation may help in some regard. Also, I have a question. If my IACV is unplugged and compensated for with my AEM EMS, could that affect the issue I am having with the A/C not working? It blows air but its not cold and has been recharged and determined to be holding pressure without evidence of leaking.
Any help would be appreciated. I'm trying to figure out if I should go ahead and find an A/C ECM unit to replace mine with or if the IACV being unplugged is ultimately the issue. Thanks in advance!
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#8
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I just recently took my car to the shop as I'm not as well versed in the electrical aspects as you guys and after a whole lot of diagnostics they determined that I would need to replace my A/C ECM. Its not sending out the ground signal for the A/C relay. They attempted a bypass but it didn't work and the only other option they said would eventually melt the wire due to the increased volatge.
Not sure if that's the problem you're having, but I though my situation may help in some regard. Also, I have a question. If my IACV is unplugged and compensated for with my AEM EMS, could that affect the issue I am having with the A/C not working? It blows air but its not cold and has been recharged and determined to be holding pressure without evidence of leaking.
Any help would be appreciated. I'm trying to figure out if I should go ahead and find an A/C ECM unit to replace mine with or if the IACV being unplugged is ultimately the issue. Thanks in advance!
Not sure if that's the problem you're having, but I though my situation may help in some regard. Also, I have a question. If my IACV is unplugged and compensated for with my AEM EMS, could that affect the issue I am having with the A/C not working? It blows air but its not cold and has been recharged and determined to be holding pressure without evidence of leaking.
Any help would be appreciated. I'm trying to figure out if I should go ahead and find an A/C ECM unit to replace mine with or if the IACV being unplugged is ultimately the issue. Thanks in advance!
I highly doubt your iacv being unplugged has anything to do with the ac not working.
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