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  1. #1
    Frank
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    Engine temp gauge drops to bottom - thermostat or temp sensor? - P0116

    A few weeks ago, all my dash warning lights came on, together with a loud alert sound. It went away within a few seconds and everything seemed just fine so i didn't think too much of it. Today, I noticed my temperature gauge was all the way at the bottom so it wasn't working at all. I turned off the car, started it up again and everything seemed fine. No CEL in booth cases.

    I don't know if these 2 incidents are related or not. Is there a common cause for these gremlins?

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    Last edited by nordwulf; 21 December 2010 at 23:05. Reason: Changed title

  2. #2
    Jose Luis
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    Quote Originally Posted by Wulf View Post
    A few weeks ago, all my dash warning lights came on, together with a loud alert sound. It went away within a few seconds and everything seemed just fine so i didn't think too much of it. Today, I noticed my temperature gauge was all the way at the bottom so it wasn't working at all. I turned off the car, started it up again and everything seemed fine. No CEL in booth cases.

    I don't know if these 2 incidents are related or not. Is there a common cause for these gremlins?
    don't care for sporadic failures...
    -my thoughts,
    about dash warning lights came on, it could be a millisecond dielectric short circuit (due to moisture) contacts between terminals; a failure terminals contact, a high pick tension........., radar detectors, attenuators signals near the police stations....... don't care if there is no code.

    for the temperature gauge, that is rare, no signal; if the temperature sensor in short circuit you found the culprit.
    sometimes the gear-needle inside the cluster gauge stuck it. some knocks with the finger in the crystal recover the right position.
    -I may be wrong

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  3. #3
    Frank
    Administrator nordwulf's Avatar
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    I read about the temperature gauge dropping to the bottom is the system telling you there is something wrong with the engine temperature. It happened again today and I noticed the gauge has been a bit on the low side lately. It sounds like I have a faulty thermostat.

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  4. #4
    Jose Luis
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    Quote Originally Posted by Wulf View Post
    I read about the temperature gauge dropping to the bottom is the system telling you there is something wrong with the engine temperature. It happened again today and I noticed the gauge has been a bit on the low side lately. It sounds like I have a faulty thermostat.
    there is no temperature sensor in the engine?
    9-3 Saab, the temperature sensor send the resistance value to the engine control unit to the gauge temperature.
    I am not sure about 9-5

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  5. #5
    Frank
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    Yes, it does have a coolant temp sensor. That may be bad as well.

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  6. #6
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    I would change out the sensor and thermostat. And heck if your anti-freeze is new I would change that out too. Now I don't about theother issue. Maybe the temp sonsor messing up made the car throw all the bells and whistles at you? Goodluck Wulf.

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  7. #7
    Jeffrey
    Master SaabTech/Moderator Burnsside42's Avatar
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    Sounds like the coolant temperature sensor to me. These control the gauges in the T7 cars - and also CAN throw a CEL often in an OG9-5 or OG9-3 with a P0116 - meaning a coolant temp. ciruit performance problems. I usually change the T-stat with the sensor when I do these on customer cars. Depending on the coolant I like to flush the system too.

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    European Motor Services, LLC - Point Pleasant, PA 18950 - www.europeanmotorsvc.com

  8. #8
    Frank
    Administrator nordwulf's Avatar
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    Thanks for the advice. They both are inexpensive ($40 for both) so I might as well do both at the same time. Is it best to use a OEM thermostat or are aftermarket thermostats at my local part store or eEuroparts (Whaler) just as good?

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  9. #9
    Jose Luis
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    sometimes OEM parts at dealers are cheaper than aftermarket parts.
    don't forget to replace the washer and rings with new ones. maybe, included in the kit.

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  10. #10
    Jeffrey
    Master SaabTech/Moderator Burnsside42's Avatar
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    Saab Thermastat KIT - includes gasket # 30577561 Eeuroparts has it for $24.52 (can be had for less @ dealer)
    Saab Coolant Temp Sensor # 15393755 Eeuroparts has it for $16.23 (about the same at the dealer - slightly less @ dealer)

    Please note - my dealer prices are from Fred Beans Saab in Doylestown, PA via the "saabnet" account which I had setup for saablink members for 15% above cost.
    Feel free to call and iquire about the saabnet pricing - ask for Brian in Saab Parts via 215-345-7222

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    European Motor Services, LLC - Point Pleasant, PA 18950 - www.europeanmotorsvc.com

 

 

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