Need: A/C wiring diagram. 05-09-2007 10:36 PM #1 Does anybody have a wiring diagram for the A/C system for a MKIV Jetta? VR6 if it matters.
My air conditioning stopped working. Pressures look good. No voltage at the compressor. No voltage at the switch in the passenger/firewall corner of the engine bay.
I pulled the fan control module (relay in the big black box under the battery) and disassembled and it looked good. Besides, when I hit the A/C button I can hear the relay click and the rad fans start spinning.
So I need to take a look at a schematic to figure out where the break is. A physical layout would be nice too so I can actually find whatever seems to be the culprit.
Thanks!
2013/3/22(金) 午後 8:31
When you press the button, does the compressor spin? If not, then you may have a faulty clutch coil. To check the coil, put an ohm-meter across the clutch pins. Around 4 ohms and you are good. You can test the coil by putting 12v across the 2 pins. If it energizes and spins the compressor, then it's not the clutch.
Mike
2013/3/22(金) 午後 8:34
I'll give it a shot, but shouldn't I be getting 12V at one of the wires on the 2-wire harness at the compressor?
2013/3/22(金) 午後 8:35
dennisgli Member Join Date: May 17th, 2003 Posts: 12,061 Re: Need: A/C wiring diagram. (BikerFry) 05-10-2007 10:52 AM #4
If it's the fuse, your EPC and brake light come on...trust me on this one. I will be following this, bc mine randomly blows a fuse. Usually when it's above 85 outside. IDK, but it never happens when it isn't as warm out.
All the fuses in the fuse box look good. The links in the junction box on top of the battery are also good.
Like I said, the AC button clicks the relay under the battery which should energize the compressor clutch coil and the radiator fans. The fans spin, but neither the clutch nor that one pressure switch get any voltage.
2013/3/22(金) 午後 8:38
One way or another I'll probably have to get ahold of a schematic for this one. I think there's another pressure switch and a temp switch somewhere?
Modified by BikerFry at 8:35 AM 5-10-2007
BikerFry
2013/3/22(金) 午後 8:39
if you can wait until 730 i have the bentley .pdf file with the full diagram but i'm at work right now.
コメント（15）
Need: A/C wiring diagram.
05-09-2007 10:36 PM #1
Does anybody have a wiring diagram for the A/C system for a MKIV Jetta? VR6 if it matters.
My air conditioning stopped working. Pressures look good. No voltage at the compressor. No voltage at the switch in the passenger/firewall corner of the engine bay.
http://forums.vwvortex.com/showthread.php?3228218-Need-A-C-wiring-diagram.
2013/3/22(金) 午後 8:30
I pulled the fan control module (relay in the big black box under the battery) and disassembled and it looked good. Besides, when I hit the A/C button I can hear the relay click and the rad fans start spinning.
So I need to take a look at a schematic to figure out where the break is. A physical layout would be nice too so I can actually find whatever seems to be the culprit.
Thanks!
2013/3/22(金) 午後 8:31
When you press the button, does the compressor spin? If not, then you may have a faulty clutch coil. To check the coil, put an ohm-meter across the clutch pins. Around 4 ohms and you are good. You can test the coil by putting 12v across the 2 pins. If it energizes and spins the compressor, then it's not the clutch.
Mike
2013/3/22(金) 午後 8:34
I'll give it a shot, but shouldn't I be getting 12V at one of the wires on the 2-wire harness at the compressor?
2013/3/22(金) 午後 8:35
dennisgli
Member
Join Date:
May 17th, 2003
Posts:
12,061
Re: Need: A/C wiring diagram. (BikerFry)
05-10-2007 10:52 AM #4
Did you check the fuse?
2013/3/22(金) 午後 8:36
If it's the fuse, your EPC and brake light come on...trust me on this one. I will be following this, bc mine randomly blows a fuse. Usually when it's above 85 outside. IDK, but it never happens when it isn't as warm out.
vr6vdub99
Junior Member
Join Date:
Jul 1st, 2005
Posts:
88
05-10-2007 11:21 AM #5
2013/3/22(金) 午後 8:37
All the fuses in the fuse box look good. The links in the junction box on top of the battery are also good.
Like I said, the AC button clicks the relay under the battery which should energize the compressor clutch coil and the radiator fans. The fans spin, but neither the clutch nor that one pressure switch get any voltage.
2013/3/22(金) 午後 8:38
One way or another I'll probably have to get ahold of a schematic for this one. I think there's another pressure switch and a temp switch somewhere?
Modified by BikerFry at 8:35 AM 5-10-2007
BikerFry
2013/3/22(金) 午後 8:39
if you can wait until 730 i have the bentley .pdf file with the full diagram but i'm at work right now.
vrsixt9
2013/3/22(金) 午後 8:40
That would be awesome!
jfry1982@adelphia.net
Thank you!
2013/3/22(金) 午後 8:41
TTT
Would you mind emailing me that fileif you have it? Thanks in advance!
BikerFry
2013/3/22(金) 午後 8:42
Bump.
VR69 you've got an email.
Anyone else that might have some input, it would be appreciated!
BikerFry
2013/3/22(金) 午後 8:44
dont use the email hooked up to this account. but im uploading the a/c diagram, sorry i forgot the other day, they will be uploaded with in the hr.
here you go man, sorry it took so long.
vrsixt9
2013/3/22(金) 午後 8:46
did they help you?
vrsixt9
Uh, I think he was looking for a wiring diagram for the A/C not a hose diagram for the cooling system.
dennisgli
oh well i did what i could
vrsixt9
2013/3/22(金) 午後 8:49
Volkswagen USA @VW 22分
#VWFunFact - Our VR6 engine is a combo of a V6 and an inline six: http://vwoa.us/150tEYB
2013/6/28(金) 午前 6:35