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Check engine light, thermostat and ECT failure S70

posted by  bucky2003 on  Wed Jan 14 13:46 CST 2004
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I think the thermostat and ECT sensor failed on my S70 during record cold in New England. The car seems to be driving fine, but will I damage more expensive components, if I wait for warmer weather next week before replacing the parts.

Bay 13 suggests using a 7 inch long 40 torx bit(3/8 drive) to remove the thermostat cover, but my auto supply/hardware stores only carry a torx 3/8 inch socket that is too short and fat to reach the back screw. Can anyone suggest a source for the longer torx bit?

If I don't want to drain the coolant, what kind of clamp are people using on the radiator hose to prevent spillage?

Thanks.








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    Check engine light, thermostat and ECT failure S70

    posted by  someone claiming to be Samurai on  Thu Jan 15 03:31 CST 2004 [RELATED]

    How do you know the temp sensor is bad. When my thermostat failed it threw a code for the sensor but the old Volvo mechanics who fixed it just replaced the thermostat and reset the ECU and it's been fine since.

    -Sam








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      Check engine light, thermostat and ECT failure S70

      posted by  bucky2003 on  Thu Jan 15 08:21 CST 2004
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      It looks like you were right. I replaced just the thermostat and everything seems normal now. Heat is nice and warm, and the gauge is reading at the 3 o'clock position even though it's 4 degrees outside. Maybe the fan was running as a precaution, because of the Check Engine condition. Thanks.








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      Check engine light, thermostat and ECT failure S70

      posted by  bucky2003 on  Thu Jan 15 04:39 CST 2004
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      Initially, I thought the problem was just a bad thermostat. However, on my last trip the electric radiator fan continued to run after I shut off the engine. I think that indicates the ECT sensor is reporting bad data.








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        Check engine light, thermostat and ECT failure S70

        posted by  NC-CH Volvo on  Fri Feb 20 08:06 CST 2004
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        I got the ECT 123 code JUST as I was on my way to get the state inspection to finish the registration process on my car. Volvo $100 to replace thermostat... independent mechanic $80-$100 to replace thermostat. Local parts store $6.45 for a thermostat.

        I'm hoping that's all it is - sounds same.

        Does anyone know if/how long one has to drive to have the codes clear out? Anything I can do to clear the codes? It'll still fail the "test" if the codes are in there.

        Thanks







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