308 GT4 - Water Temp Gauge not working | FerrariChat
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308 GT4 - Water Temp Gauge not working

Discussion in 'Technical Q&A' started by necron2600, Apr 14, 2005.

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  1. necron2600

    necron2600 Rookie

    Feb 7, 2005
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    NW of Boston, MA USA
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    Kevin
    #1 necron2600, Apr 14, 2005
    My water temp gauge does not seem to work in my '79 308 GT4 (or I am having very good cooling at 60C ;) The oil temp does work (~90C running). I have looked through the 308 GT4 shop manual but I could not seem to find anything that pinpoints where to look.

    Anyone have any ideas on how to fix this? The location of the sensor? Or how to test it? Do I even need to worry about the water temp and just rely on the Oil temperature?

    Thank you!
    -Kevin
     
  2. matteo

    matteo F1 World Champ

    Aug 1, 2002
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    Heir Butt
    #2 matteo, Apr 14, 2005
    Replace it. It's on the lower passenger side of the radiator. VW's use the same sensor.
     
  3. Llenroc

    Llenroc F1 Veteran
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    Jun 9, 2004
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    Vern
    #3 Llenroc, Apr 14, 2005
    When I owned my GT-4 years ago I had to give my oil pres. and temp gauges a tap on the glass of the gauge to get the needle to move off the peg.
     
  4. Iain

    Iain F1 Rookie

    Jan 21, 2005
    3,354
    UK
    #4 Iain, Apr 14, 2005
    Isn't that that the electric fan switch sensor? On a 328 the temp guage sensor is in the cast pipe that crosses between the two heads right in the middle of the V of the engine underneath the intake plenum chamber.

    I.
     
  5. pma1010

    pma1010 F1 Rookie

    Jul 21, 2002
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    Philip
    #5 pma1010, Apr 14, 2005
    Iain is right. The one on the rad is for the fans. Water temp sender is under the "Y" on the water pipes connecting the intake manifold to water pump. Start by checking connection of lead.
    Philip
     
  6. necron2600

    necron2600 Rookie

    Feb 7, 2005
    29
    NW of Boston, MA USA
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    Kevin
    #6 necron2600, Apr 18, 2005
    Thanks everyone for providing input!

    I ended up taking the 308 GT4 to my Fcar mechanic. The water sender was disconnected (unplugged). I had watched him fix it. I am in no way a mechanic so my explanation of what I saw may not be the best.

    The water sender is in the V underneath the carbs more to the right side of the block. It is on the thermostat housing. It was difficult to get to it so the Oil Filter was removed. This allowed easier access inside the V. A pair of pliers was needed to place the wire/connector on the sender unit due to the tight spot.

    After I had that fixed.. I had a fuel line leak and lost a tank full of gas within 10 minutes. Still the original fabric covered fuel lines (48k miles).

    ...But I did have a smile on my face the entire 10 minutes of driving my GT4 ;)

    -Kevin
     
  7. matteo

    matteo F1 World Champ

    Aug 1, 2002
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    Heir Butt
    #7 matteo, Apr 18, 2005
    Kevin,

    You really need to have all the fuel lines replaced along with the filler neck and the hose between both tanks.

    If they are indeed original, then you have a fire hazard.
     
    Erol likes this.

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