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To Cruise or Not To Cruise 850

posted by  2pedallers on  Wed May 10 11:27 CST 2006
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The cruise control in my 94 855 started to fail occassionally two summers ago. At first, on hot afternoons it simply would not engage. Then, on hot days if I tapped the brakes it wouldn't resume. The next morning, the cruise would work fine. As the warmer days became fewer the cruise would work fine. I can't recall an instance between October and late March that the cruise control failed.

Last summer the problems became more frequent, but again went away in the winter. This year, since the weather has started to warm up, they are nearly constant.

As a "Safety Professional" (fits with driving a Volvo, right!) I advocate using cruise control as one means to increase attention to what is going on around us in our cars...instead of constantly worrying about speed. And, as we all know a steady speed improves fuel mileage (my average is 30+). So, I miss my cruise control.

Any help in running this latest problem to ground will be appreciated.

Be Safe...and Keep Pedalling







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    To Cruise or Not To Cruise 850

    posted by  james_a_sousa on  Tue May 16 15:41 CST 2006
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    last visit: Thu Oct 23 18:51 CST 2014
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    What sort of consulting do you do?

    Everything that I have read indicates that using cruise control lessens a driver's attention to the task of driving.

    I have also read that a good driver can easilly get better mileage than cruise control. One thing that I do is to speed up slightly on downhills, and let the speed drop off a bit on uphills.
    --
    '96 855R,'64 PV544, '67 P1800, '95 855, '95 854, the first three are mine, heh, heh, 405,000 miles put on 8 bricks








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    To Cruise or Not To Cruise 850

    posted by  someone claiming to be Valvo on  Sun May 14 01:49 CST 2006 [RELATED]

    My 96 has exactly the same symptoms,it's winter here in Oz so everything works OK at the moment.
    My local Volvo mechanic swapped out the control module in the fuse box with a known working one during summer and proved the fault to the module.
    Shades of ABS module disease?

    regards....Valvo








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      To Cruise or Not To Cruise 850

      posted by  MadeInJapan on  Sun May 14 02:39 CST 2006
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      last visit: Sat Oct 2 06:34 CST 2010
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      If it is ABS, when it comes and "goes," symptoms will be no speedometer and cruise control. Make sure your speedometer is also not working during these times. If so, then I'd suspect the ABS. Otherwise, I'd suspect the vacuum lines to the cruise control module. Possibly the replacement and your current issue is unrelated. All of the cruise control units in the 850's eventually develop a vacuum hose leak and stop responding.
      --
      1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.








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    To Cruise or Not To Cruise 850

    posted by  Torque on  Wed May 10 11:48 CST 2006
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    last visit: Fri Aug 1 10:12 CST 2014
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    On my 1997 the cruise is actuated by a vacuum line that runs under or near the battery (my recall is weak). The dealer replaced the vacuum line, very simple job, and it now works.








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      To Cruise or Not To Cruise 850

      posted by  MadeInJapan on  Wed May 10 12:52 CST 2006
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      last visit: Sat Oct 2 06:34 CST 2010
      [RELATED]

      True...probably vacuum lines expanding its leak as the weather gets hotter. It's under the battery. Just find the leak and swap out that part of the hose. Otherwise Volvo sells a kit, but splicing is still required.
      --
      1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.







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