I lived with this problem for over a year. 2004 Aero.
Here is what I finally found out.
1. The temperature gauge would always work in the summer.
2. When out side air temperature dropped, the guage worked after a startup, bu never rose very far. After 5 to 15 minutes the gauge would suddenly drop to nothing and never read again wuntil the car was stopped and restarted.
3. I learned that the gauge is NOT directly connected to the temperature sensor on the engine, but rather to the computer. The computer not see adequate temperature readings after a period shuts the gauge off to indicate you have a low engine temperature.
4.I bought an OBD reader that can readout many functions on a continous basis. With that I could montior the temperature as I was driving. Even when the dash gauge shut off. What I found that on warm days in traffic the temps would go up to 180, but under way never got over 160. However once the ambient air temp fell below 50, then it ran about 130 -140. And it was those conditions that shut the gauge off.

5. So after the Saab dealer said the charge to replace the thermostat was $215 plus tax, I bought a new thermostat from a site sponsor Eeuroparts, puzzled over how much easier it was do get at on my 9000 with the same engine and finally just started in with small sockets and changed it in less than 45 minutes. Of course I could do again in half that time. I did find that the existing Thermostat did not quite seat all the way shut.

6. New thermostat, car runs at 183 degrees matter how cold it is outside, dash gauge is in the middle and check engine light or pending code for low temp has gone away.

BTW I was not aware unil I got his OBD reader that the system supported real time read out. I shows Throttle position, amount engine load, and at least 20 more items. You can even graph them on the reader.

Bill


posted by 67.240.8...

• Grumble, grumble, another problem!, Richard Scott, Sat, 21 Nov 2009 18:25:43
  • Re: Grumble, grumble--TG was right on, Richard Scott, Mon, 23 Nov 2009 23:38:18
  • No biggie, replace the thermostat, LG Aero, Sun, 22 Nov 2009 07:02:33 <-- Viewing This Message
    • With Open SID you get all that on the SID...., Mark from Toronto, Sun, 22 Nov 2009 11:45:45
      • Tell us more about Open SID...nm, AlS, Sun, 22 Nov 2009 11:48:50
        • Re: Tell us more about Open SID.. - link, Mark from Toronto, Sun, 22 Nov 2009 12:01:24
  • Stubby 19mm wrench, MI-Roger , Sun, 22 Nov 2009 04:48:43
    • Re: Stubby 19mm wrench-or even......., Paul de k, Sun, 22 Nov 2009 10:23:51
  • Re: Grumble, grumble, another problem!, SWEDECAR , Sat, 21 Nov 2009 21:51:49
  • Re: Grumble, grumble, another problem!, maxllama, Sat, 21 Nov 2009 19:53:41
  • Re: Grumble, grumble, another problem!, TG, Sat, 21 Nov 2009 18:34:33
    • Re: Grumble, grumble, another problem!, Shondor, Mon, 14 Dec 2009 14:08:52

No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.

• Prev by Date: Stubby 19mm wrench, MI-Roger, Sun, 22 Nov 2009 04:48:43
• Next by Date: This valve is junk !, LG Aero, Sun, 22 Nov 2009 07:15:51
• Main 9⁵ Bulletin Board

StateOfNine.com

SaabClub.com

Jak Stoll Performance

M Car Covers

Ad Available

The content on this site may not be republished without permission. Copyright © 1988-2024 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]

Random Saabnet.com Member Gallery Photos (Click Image)