testing gm coolant temperature sensors

Discussion in 'General Truck Forum' started by davbell22602, Dec 27, 2009.

  1. davbell22602

    davbell22602 Senior Member

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    To test the coolant sensor, unplug the wire connector and test the resistance across the two terminals of the SENSOR with an ohm meter.

    The sensor screws into the intake manifold, on the front passenger side, by the thermostat housing.

    Coolant sensor approximate resistance specifications:
    177 ohms @ 212 deg. F. or 100 deg. C.
    241 ohms @ 194 deg. F. or 90 deg. C.
    332 ohms @ 176 deg. F. or 80 deg. C.
    467 ohms @ 158 deg. F. or 70 deg. C.
    667 ohms @ 140 deg. F. or 60 deg. C.
    973 ohms @ 122 deg. F. or 50 deg. C.
    1188 ohms @ 113 deg. F. or45 deg. C.
    1459 ohms @ 104 deg. F. or 40 deg. C.
    1802 ohms @ 95 deg. F. or 35 deg. C.
    2238 ohms @ 86 deg. F. or 30 deg. C.
    2796 ohms @ 77 deg. F. or 25 deg. C.
    3520 ohms @ 68 deg. F. or 20 deg. C.
    4450 ohms @ 59 deg. F. or 15 deg. C.
    5670 ohms @ 50 deg. F. or 10 deg. C.
    7280 ohms @ 41 deg. F. or 5 deg. C.
    9420 ohms @ 32 deg. F. or 0 deg. C.
    12300 ohms @ 23 deg. F. or -5 deg. C.
    16180 ohms @ 14 deg. F. or -10 deg. C.
    21450 ohms @ 5 deg. F. or -15 deg. C.
    28680 ohms @ -4 deg. F. or -20 deg. C.
    52700 ohms @ -22 deg. F. or -30 deg. C.
    100700 ohms @ -40 deg. F. or - 40 deg. C.
     
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  2. bradrhale

    bradrhale Senior Member

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    this is assuming that you have an ohmmeter that can read that and the person actually mixed the antifreeze right. in the northern most part of canada. if they didnt mix it right and it froze, there is really no point in testing that sensor, i dont believe.
    good info though.
     

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