Volvo RWD 140-160 Forum

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FI Questions 74 160 140-160 1974

posted by  Winnipeg164 on  Thu May 1 12:56 CST 2003
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The auxillary air regulator has two hoses running off of it.The hose that goes to the intake manifold has a "gizmo" with two wires coming off of it? It is near the big Idle Screw. Anybody know what this does? One of the contacts has broken off....where can I get a new one? Also: If you were standing in front of the car looking at the engine...there is a two wire connector behind the AAR,in the block...is this the "thermal time switch? Any input appreciated.








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    FI Questions 74 160 140-160 1974

    posted by  walrus3 on  Fri May 2 03:15 CST 2003
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    last visit: Mon Dec 2 14:20 CST 2013
    [RELATED]

    The thermal time switch fits into a 1/2" pipe thread and has screw terminals.
    It probably has a 9/16" hex on it. The temperature sensor has a metric
    thread that is probably about 8mm and has two 0.110" slip-on terminals,
    and about a 13mm hex with a copper gasket. The temp sensor looks almost
    exactly like the temp sensor that goes into the front panel to measure
    incoming air temp but they are NOT interchangeable and have greatly different
    resistance values. I can check the values for you if you need me to.
    --
    George Downs, The "original" Walrus3, Bartlesville, Oklahoma








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    FI Questions 74 160 140-160 1974

    posted by  uniberp on  Fri May 2 01:40 CST 2003
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    last visit: Mon Jan 31 07:08 CST 2011
    [RELATED]

    Thermal timer switch is toward teh back of the block, under the #4 exhaust manifold pipe. Just above and to the left of the oil filter, looking at the car from the passenger side.








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    FI Questions 74 160 140-160 1974

    posted by  someone claiming to be David Eisenberg on  Thu May 1 13:47 CST 2003 [RELATED]

    Is this gizmo about 2" long and maybe 3/4" diameter? If so, I think you are talking about an auxiliary air solenoid which is controlled by the air conditioner compressor. One wire runs from the compressor to this solenoid and the other from the solenoid to ground. When the compressor comes on, the solenoid opens, a little extra air is allowed in, idle rises a bit to compensate for the drag of the compressor.








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      FI Questions 74 160 140-160 1974

      posted by  Winnipeg164 on  Thu May 1 17:02 CST 2003
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      Thanks for the info.....I guess the chances of buying one of these new is pretty slim. Probably anything similar on a Volvo AC of any model would do the job.








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        FI Questions 74 160 140-160 1974

        posted by  gt6 on  Fri May 2 00:21 CST 2003
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        last visit: Wed Jul 17 19:44 CST 2013
        [RELATED]

        Just a confirmation - David is right, that's the A/C idle compensator solenoid.

        BTW, if you're ever interested in a '74 164 parts car, I'm looking to get rid of one. It's in South-central PA, a bit of a haul for you.
        --
        Speed Racer, '83 240 R, '74 164 E, '93 940 OL1 (Manchester, CT)








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    FI Questions 74 160 140-160 1974

    posted by  Phil S. on  Thu May 1 13:31 CST 2003
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    last visit: Fri Oct 24 13:18 CST 2014
    [RELATED]

    Um, not sure what your gizmo is. Is it attached to the hose itself? The two-wire thing next to the AAR is the coolant temperature sensor (a.k.a. sensor #2).








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      FI Questions 74 160 140-160 1974

      posted by  Winnipeg164 on  Thu May 1 13:55 CST 2003
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      The gizmo is 2" long and cylinder shaped with a ground wire going to the ground on battery battery tray and one other lead. It is very close to the idle adjuster. Possible AC connection? Where is the Thermal time switch located?







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