Volvo Cruise Control circa 1978

Discussion in 'General Motoring' started by Steve Rogers, Jun 30, 2003.

  1. Steve Rogers

    Steve Rogers Guest

    I have a 78 245 DL with an owner installed cruise control that cost
    119.95 in 1978 when it was installed. I repaired it when I purchased it
    from the original owner by replacing the original relay (whose coil had
    burned out) with a not exact but equivalent replacement. It worked
    several years after that, but has finally quit again.

    My troubleshooting indicates that it is probably the totally analog
    "Speedostat" controller unit. This unit has an input and an output for a
    speedometer cable to reference vehicle speed, and an input and output
    vacuum tube that goes to a vacuum servo. After all, the 78 Volvos had no
    computer controlled anything.

    I'm looking for a way to repair, but I fear that the speedostat unit is
    obsolete. I'm planning on a trip to some upick yards for a look-see. I
    think that that part may also be used on other cars besides Volvos.

    I'd also like to consider a newer electronic unit, provided that it has
    similar signals to the analog unit, so I can use my existing turn signal
    stalk speed control switches and existing under the dash wiring. Since
    I have a manual transmission, I could get the vehicle speed sensing from
    the tach (or ignition). I'll never use the speed control except in 4th
    or 4th with OD, so the clutch switch will kill the speed references
    between switches between OD in and out, as I always clutch with OD in or

    Does anyone have any experiences with fixing or refitting cruise control
    to older Volvos before the electronic injection?
    Steve Rogers, Jun 30, 2003
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