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1981 Porsche 928 Climate control wiring harness question / wire color order

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Old 04-07-2012, 08:45 PM
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tavella
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Default 1981 Porsche 928 Climate control wiring harness question / wire color order

I have searched around the forums and I'm not finding exactly what I am looking for and hope someone might be able to assist me.

I removed the climate control unit in hopes that I could possibly clean the board to possibly stop the buzzing noise when the unit is turned off and maybe get the A/C working.

When I pulled the wiring harness on the left side of the unit (next to the **** to control the fan speed) the top of the harness block came out and all of the wires fell out of the harness. I don't know what order they are supposed to be in. The unit has 1,2,3,4,5 listed on the climate control system but there are two red wires (one with a black stripe) and the other three are white. One with that is plain white, one with a blue stripe, and one with a green stripe.

Does anyone know which order these wires are placed back in to the harness?



Old 04-08-2012, 02:12 AM
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MainePorsche
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1 - white
2 - white/green
3 - white/blue
4 - red/black
5 - red/white

Your bottom picture looks like a red/black & red/white wires.
Your text however says a red and a red/black wire.

The above legend is from the Current Flow Diagram, Track 5, page 97-103 WSM
Good Luck with the job.
Old 04-08-2012, 09:46 AM
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tavella
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Originally Posted by MainePorsche
1 - white
2 - white/green
3 - white/blue
4 - red/black
5 - red/white

Your bottom picture looks like a red/black & red/white wires.
Your text however says a red and a red/black wire.

The above legend is from the Current Flow Diagram, Track 5, page 97-103 WSM
Good Luck with the job.
You are correct it is a red/white wire. Thank you VERY much for replying!
Old 04-08-2012, 01:22 PM
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MainePorsche
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If you don't have Work Shop Manuals, you need to get them. See recent post.
Old 04-08-2012, 01:59 PM
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WallyP

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The buzzing may well be vacuum, rather than electrical.

With the engine running and the buzzing audible, unplug the small black/blue drum-shaped check valve from the vacuum brake booster. If that is the source of the buzzing, you have a vacuum actuator which has failed.

If you go to our web site, then tips & links, then Wally's World, then the HVAC section, you will find info that will tell you how to test the vacuum actuators.
Old 04-08-2012, 03:16 PM
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tavella
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Originally Posted by MainePorsche
If you don't have Work Shop Manuals, you need to get them. See recent post.
I ordered a set from eBay in a cd format as that is all I could find. I purchased it on thursdaycand expect it soon. That's again.
Old 04-08-2012, 03:16 PM
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tavella
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Originally Posted by WallyP
The buzzing may well be vacuum, rather than electrical.

With the engine running and the buzzing audible, unplug the small black/blue drum-shaped check valve from the vacuum brake booster. If that is the source of the buzzing, you have a vacuum actuator which has failed.

If you go to our web site, then tips & links, then Wally's World, then the HVAC section, you will find info that will tell you how to test the vacuum actuators.
I'll check that out as well. Thanks!



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