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ACC unit: 'AC push OFF' vs 'the snowflake' 900 1991

posted by  someone claiming to be Cabbie2169 on  Wed Aug 15 01:29 CST 2007 [RELATED]

91 940 Turbo

The "AC push OFF" pushbutton quit working; i.e., when the button is raised the AC won't come on. I heard that this is common problem resolved by re-soldering the ACC board. I had another idea: I traded an old wiring harness for an '86 that I no longer own for a used ACC board. (local volvo parts place in Atlanta called Voluparts). The only difference between my ACC board and the one that I got is the new one has a snowflake on the pushbutton whereas mine has the backwards logic "AC push OFF" label.

I installed the new snowflake unit and alot of dash warning lights came on ..like the battery light, airbag light, service engine light, check engine light. So I unplugged the unit and installed the old one that doesn't work.

Can anyone confirm that the snowflake unit won't work on the "push-OFF" units on 91 940 turbos?

I suppose I'll go back to Voluparts today ..but the guy said it would work. He didnt' have any with the "push-Off" label. By the way...can you imagine engineering a circuit that stays ON unless you depress a button that says "push OFF?" geeze.

Anyone know how I can fix the existing ACC board?

Help.
Cabbie2169








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    ACC unit: 'AC push OFF' vs 'the snowflake' 900 1991

    posted by  Steve on  Wed Aug 15 10:04 CST 2007
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    last visit: Fri Oct 24 07:16 CST 2014
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    It is truly a dumb design, fixed I believe in 1993 when they went back to the intuitive "push=ON" design.

    Try resoldering the relay on the old board per FAQ instructions; this is the usual failure mode. If the switch is defective, take the switch off the new board and install on the old one: it should work.







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      ACC unit: 'AC push OFF' vs 'the snowflake' 900 1991

      posted by  Cabbie on  Sun Aug 19 14:22 CST 2007
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      last visit: Mon Jun 2 15:54 CST 2014
      [RELATED]

      I think I'm gonna have to try and solder the old board. Sounds like a risky and low success option...but others have done correctly.
      Cabbie







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