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07 December 2010 #1
Frank Administrator
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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?Last edited by nordwulf; 21 December 2010 at 23:05. Reason: Changed title
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07 December 2010 #2
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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19 December 2010 #3
Frank Administrator
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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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19 December 2010 #4
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20 December 2010 #5
Frank Administrator
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Yes, it does have a coolant temp sensor. That may be bad as well.
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20 December 2010 #6
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- 06' 9-5 Sportcombi, 06' Sport Sedan
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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21 December 2010 #7
Jeffrey Master SaabTech/Moderator
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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.
European Motor Services, LLC - Point Pleasant, PA 18950 - www.europeanmotorsvc.com
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21 December 2010 #8
Frank Administrator
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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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21 December 2010 #9
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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21 December 2010 #10
Jeffrey Master SaabTech/Moderator
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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 215-345-7222European Motor Services, LLC - Point Pleasant, PA 18950 - www.europeanmotorsvc.com
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