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ECT sensor location (engine coolant temperature) 850 1997

posted by  brownbear on  Tue Dec 21 09:13 CST 2004
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I am looking for the engine coolant temperature (ECT) sensor in the 1997 855 T AWD. The manual says it’s on left front of the engine and has wires yellow/grey and brown/black. I have not been able to locate it and can use some assistance.

Can you please describe (with some greater detail) where one finds this thing?

Is it in the lower block, or upper side, or..? What kind of connector should I be looking for? I am assuming that the left front of the engine is at the driver’s side close to the radiator; in essence, near the battery. Is that correct?

All help is appreciated.

Ofer







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    ECT sensor location (engine coolant temperature) 850 1997

    posted by  someone claiming to be 4 Volvos on  Tue Dec 21 10:19 CST 2004 [RELATED]

    Its screwed into the lower t-stat holder.








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      ECT sensor location (engine coolant temperature) 850 1997

      posted by  dwc on  Tue Dec 21 17:41 CST 2004
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      last visit: Thu Jun 14 04:22 CST 2001
      [RELATED]

      That's correct; it's on the bottom half of the thermostat housing. To access it you'll have to likely open the thermostat housing and move that top part (you can keep the hoses attached) towards the passenger side of the engine bay. If you're sure the sender is bad, clip the wires and remove the sender with a 19mm socket. When you install the new one, make sure the aluminum sealing washer is on the sender, screw it in place by hand, and then snug it up with a 19mm box or open-end wrench. Finally, attach the wiring connector, and replace the thermostat top housing with a new rubber seal.

      BTW, I just bought a new sender from www.fcpgroton.com last week for $30, along with a new reservoir cap ($4), and thermostat and seal ($8).

      Regards,

      Dean








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        ECT sensor location (engine coolant temperature) 850 1997

        posted by  brownbear on  Sun Dec 26 11:10 CST 2004
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        Thank you for the information. I have tried to find the sensor and have to admit that I cannot even find the thermostat housing. I followed the lower rad hose back to the engine thought its convoluted path: under the intake air duct; under the distributor; under the turbo air duct, and to where the rad hose joins a metallic pipe leading to the passenger compartment side of the engine.

        How much of this stuff do I need to disassemble to get at the thermostat housing and locate the sensor?

        I would just like to get at the connector to measure the resistance of the sensor when the engine is cold, and then again when it's hot. I believe that it is causing the difficulty in starting the engine when the engine is hot.

        Also, my Datsun has two sensors, one connected to the computer module and one for the instrument panel indicator gauge. Does the 850 have one or two sensors? (I ask because the temperature gauge indicates the temperature properly.

        Again, my thanks for any help on this issue.

        Ofer








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          ECT sensor location (engine coolant temperature) 850 1997

          posted by  dwc on  Sun Dec 26 16:26 CST 2004
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          last visit: Thu Jun 14 04:22 CST 2001
          [RELATED]

          Hi Ofer:

          Follow the other radiator hose. The thermostat housing is just inboard of the power steering pump, at the top of the engine, under the two fuel hoses to the injector rail. That small diameter hose from the top part of the coolant expansion tank will also lead you right to it. The temp sensor is partially hidden below the radiator hose, but you should be able to feel around below the housing for the wires on th temp sensor. The wires from the sensor are several inches long, and attach to a connector that was clipped to the back of the power steering pump bracket on our car. As far as I know, there is only one sensor, for both the gauge and ECU, but I could very easily be wrong on that point.

          Regards,

          Dean







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