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Discussion Starter · #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!
 

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Re: Need: A/C wiring diagram. (BikerFry)

Quote, originally posted by BikerFry »

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.

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
 

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Discussion Starter · #6 ·
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.
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
 

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Re: (BikerFry)

Quote, originally posted by BikerFry »
Bump.
VR69 you've got an email.
Anyone else that might have some input, it would be appreciated!

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. http://****************.com/smile/emthup.gif
 

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Bikerfry i am having a similar issue.

I am told to check the 4 way connector somewhere under battery near the fcm. It supplies 2 wires to alternator and 2 wires to ac compressor. Apparently it gets loose and or damaged. I will check mine tonight.

Sent from my SM-G930W8 using Tapatalk
 
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