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Old 12-23-2019, 01:52 PM   #26
Dirty Rick
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The Haynes manual #1550 was recommended, does it have a wiring diagram for the ACC system (not ECC)?
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Old 12-23-2019, 07:50 PM   #27
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Note sure, but see on grid "O 2" coordinates in this diagram, on pdf page 8 (294); also "P 2" on grid

Some Qs&As here
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Old 12-23-2019, 11:33 PM   #28
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Sweet not 100% but a real working diagram Thanks!

The key does not list device #262 < on 83 drawing different from 82 makes me wonder if there are any changes for 84
Pink wire goes to this from the AC delay relay (this is the wire that got hot)
Also missing from key is #176 / 217 a green/yellow wire < might be Fuel ECU (AC pump signal)
Both in the Upper left corner of O-1
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Old 12-24-2019, 07:13 PM   #29
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Another glitch in the drawing.

#82 is the coolant temp switch not the control temp sensor which is #83.

And the drawing does not show where the other wire to #82 goes (I have the white wire). It is labeled as a black wire is this a ground? I'm still learning the diagrams mentality.
I am hesitant to ground it as my last test was more exciting than needed.

That wire seems to terminate with a bar, Is this a Swedish version of a ground arrow?
I also see that the blower ground(?) also seems to terminate in a similar bar symbol

Last edited by Dirty Rick; 12-24-2019 at 07:31 PM..
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Old 12-24-2019, 09:53 PM   #30
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Quote:
Originally Posted by Dirty Rick View Post
any changes for 84
Usually, OEMs stay the course, unless changes are needed.

URL: http....Volvo740-760 1982-1983 Haynes.pdf
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Old 12-24-2019, 10:10 PM   #31
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Except when they dont.

I get the impression ACC was only used for a couple of years and I'd guess it when through some change every year until it was replaced by ECC.
ACC was a mechanical version that had goofy fan control, (blower speed was set by the amount of error from the set point and controlled by vacuum).
ECC was way better, it has smarts. But has it's own issues with a solenoid rack to switch the vacuum, and a motorized(?) blend door.
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Old 12-24-2019, 10:42 PM   #32
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Volvotips.com's Green manual was not fully copied, Volvo 740, 760 and 780 body, chassis, interior and heating system repairs & maintenance – part 3

and leaves out ACC
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Old 12-24-2019, 11:41 PM   #33
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Quote:
Originally Posted by phainein7 View Post
Volvotips.com's Green manual was not fully copied, Volvo 740, 760 and 780 body, chassis, interior and heating system repairs & maintenance – part 3

and leaves out ACC
I have that book, bought it just to do this repair, but it has no wiring diagram.
That v8volvo site link you sent got me the 83 wiring diagram and that got me to where I am.
My only real question at this point is how the factory wiring diagrams depict a ground connection.
It appears it is this ---------| not an arrow or other ground symbol I am used to seeing.
I see that symbol twice in the O-2 section of that wiring diagram. Sure looks like a ground.

Last edited by Dirty Rick; 12-25-2019 at 12:02 AM..
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Old 12-25-2019, 08:30 AM   #34
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Usually.
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Old 12-25-2019, 05:45 PM   #35
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Quote:
Originally Posted by nordmaschine View Post


Usually.
Thanks, testing tomorrow.. I hope it's warmer!
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Old 12-27-2019, 01:24 PM   #36
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Quote:
Originally Posted by Dirty Rick View Post
no wiring diagram.
Mitchell and Alldata do offer subscription service for DIYer.

I'm not familiar with Alldata, but from years ago, Mitchell served my needs.
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Old 12-27-2019, 05:36 PM   #37
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I went through the whole system yesterday and the 1983 wiring diagram is good and everything tests good.

Now to reassemble and test.

I may need a "programmer" which is a Combo blend door and blower fan speed control.
NOt real sure about the temp sensors as no spec was given for the interior sensor and the ambient sensor measured ok.
The sensors are in series and I measured 164 ohms to ground at the control panel connector so the interior sensor is not open (not sure it is in spec)
I figured to assemble it and test and can then see how far off it is.
The interior sensor is above the glove box and easy to access if I need to replace it.
The ambient sensor is on the upper right side of the blower housing and can't be serviced unless you pull the whole underdash assy out of the car.
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Old 12-29-2019, 08:13 PM   #38
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Good to hear you got a good diagram. I think the system was all the same from '83 to sometime late '80s (87?).

I think I have a spare programmer unit if you need one, from an '84 I parted out. I took all the climate control stuff I could grab because I figured I might need some of it to keep the system in my '83 running but it's been dead reliable for the last 10 years so doesn't seem likely I'll ever need it.....

PM me if you need it.
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