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  1. #1
    Saab Fan
    Join Date
    28 Jan 2011
    Location
    SE Washington
    Posts
    32
    Saab(s)
    1997 900SE, 2003 9-5 Linear
    Thumbs Up:   0

    Engine not up to temperature

    Recent acquired 2003 9-5 - noticed that engine seemed to run cool according to gauge, I expected the needle to be at 9:00 position. When coasting down a hill the temp would fall. Finally got a CEL - checking with OBD-II found a P0116 - engine temp circuit - made sense. Ordered new thermostat, temp sensor, and red antifreeze from eeuroparts - installed last night. Thanks for the tutorials - instructions always make the job easier! Made a trip 15 miles north today with a long downhill stretch - the temp gauge dropped all the way down to the L! Any ideas what to check next - how to get the temp stabilized? I kept the old thermostat - I expected to find it stuck open - may bring it in the house and test on the stove. Thanks

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  2. #2
    Scott Hutchings
    Too much to do, no time! SaabScott's Avatar
    Join Date
    30 Jul 2010
    Location
    Mississauga, Ontario
    Posts
    418
    Saab(s)
    2009 9-7X 5.3i
    Thumbs Up:   1
    Sorry. You seem to have the bases covered here.
    Not sure what else to suggest.

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    President, The Saab Club of Canada
    www.SaabClub.ca

  3. #3
    Frank
    Administrator nordwulf's Avatar
    Join Date
    30 Jul 2010
    Location
    USA - Netherlands
    Posts
    7,866
    Saab(s)
    previous: 2006 9-3, 2001-06 9-5, 2011 9-4X
    Thumbs Up:   123
    Did you get another P0116 code when it dropped? I had the code on mine but without a CEL.

    Did you get the Saab thermostat with the vent hole? I first went to my local parts store and got an after-market thermostat without the hole for $12. eEuroparts sells a Saab ($24.50) and a Wahler ($16.90) thermostat. I don't know how important this vent hole is so I ordered the genuine Saab thermostat just to be sure. Perhaps you have some air trapped in the system?

    After I replaced the thermostat and temp sensor, coolant level was fine after a 200 mile drive. But it sat at an airport for 10 days and coolant (Dexcool - orange) had to be added after that.

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  4. #4
    Saab Fan
    Join Date
    28 Jan 2011
    Location
    SE Washington
    Posts
    32
    Saab(s)
    1997 900SE, 2003 9-5 Linear
    Thumbs Up:   0
    I didn't check for a code - will do that this morning - no CEL. I got the Wahler thermostat - it does have a vent hole. I will watch the coolant level the next few days. On the level, or small hills the temp seems OK, but does fluctuate some. I will also test my old thermostat - just for fun. Thanks

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  5. #5
    Saab Fan
    Join Date
    28 Jan 2011
    Location
    SE Washington
    Posts
    32
    Saab(s)
    1997 900SE, 2003 9-5 Linear
    Thumbs Up:   0
    Just checked - did not get another code from yesterdays adventure.

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  6. #6
    Jose Luis
    Saab Addict jlrSAAB's Avatar
    Join Date
    26 Oct 2010
    Location
    Espaņa
    Posts
    534
    Saab(s)
    2007 93 Aero 2.8 V6
    Thumbs Up:   0
    check the terminals in temperature sensor for a good contact and the wiring harness wires (the same color) terminals to the control unit engine.

    maybe a failure contact in terminals.

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  7. #7
    Saab Fan
    Join Date
    28 Jan 2011
    Location
    SE Washington
    Posts
    32
    Saab(s)
    1997 900SE, 2003 9-5 Linear
    Thumbs Up:   0
    Update - checked the wiring, appeared OK. Have been watching the coolant level and perhaps there was an air bubble. Have added a bit on several occasions and now temp seems to have stabilized.

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  8. #8
    I am planning on replacing the thermostat and temp. sending unit on my 9-5 3.0t soon. However, "the Saab Site" sent me the wrong parts, so that is on hold. My issue is on the freeway or very cold days, it shows all the way down on L for the temp gauge. I assume the thermostat is stuck open. After reading this thread I wonder if there is air trapped in the system. I did remove and clean out the coolant tank when I got the car because the prior owner had a used engine put in it and they didn't clean the tank out, (was a headgasket failure on orig. engine). I cleaned it out so would be easier to know if I had something going wrong with the headgasket on this replacement engine. so, when I did the cleaning it is possible I introduced some air into the system. However, that was about 3 weeks ago.

    Should the cooling system have bled out any air by now?

    I have driven the car many times, but most of my trips are less then a 1/2 hour drive. I have opened the coolant tank a couple of times and it did have pressure when I opened the orange fill cap and the coolant level has remained the same.

    Thanks for any help from a Saab newbie

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