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Old 08-03-2015, 07:31 AM   #1
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Temp gauge stuck at zero

1999 Saab 9-3 2.0T base. The temp gauge has been stuck at zero for months. No CEL. I have not changed anything yet (t-stat or CTS). Looking for advice from anyone else who may have had a similar issue before diving in.

I'm wondering if this may be behind the AC clutch not engaging as well. I can get the clutch to engage if I jumper the relay. Fuses, relay, freon Levels and high/low pressures are within spec. Not sure if the ECU is not allowing the relay to fire because it can't get an engine temp signal.
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Old 08-03-2015, 08:08 AM   #2
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I'm fairly certain that the water temps sensor in the head causes this.
Good news? $11 part.
Bad news? WAY harder to replace than it should be.
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Old 08-03-2015, 08:39 AM   #3
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9-3 A/C clutches fail often apparently, people sell clutch kits for them.
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Old 08-03-2015, 01:45 PM   #4
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9-3 A/C clutches fail often apparently, people sell clutch kits for them.
The clutch engages when I bypass the relay, so it's likely some programmed-in fail safe. Since I already checked the high and low pressure switches and the freon levels and pressures, it must be some other issue. I was told by my Saab mechanic friend (finally called me back) that if the ECU can't get an engine temp, it goes into safe mode.
I bought a CTS. We'll see if that works.
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Old 08-04-2015, 04:32 AM   #5
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Bad temp gauge should throw a CEL. It might be your cluster....
go to autozone and see if you have any pending codes. How is your gas mileage?
-Cm
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Old 08-04-2015, 08:45 AM   #6
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Put in a new CTS and all is well. Temp gauge and AC both working now. Thanks for the ideas.
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Old 08-04-2015, 08:47 AM   #7
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Originally Posted by turbocon86 View Post
Put in a new CTS and all is well. Temp gauge and AC both working now. Thanks for the ideas.
Nice! Easy fix.
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