Re: 9000 overheat diagnose complete - Saab 9000 Bulletin Board - Saabnet.com
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Re: 9000 overheat diagnose complete
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Posted by Bill Homer [Email] (#3427) [Profile/Gallery] (more from Bill Homer) on Fri, 6 Feb 2015 07:23:08 Share Post by Email
In Reply to: Re: 9000 overheat diagnose complete, sam96CS [Profile/Gallery] , Thu, 5 Feb 2015 20:29:28
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I have a 1994 car, which has a different, more traditional system for running the radiator fan than a 1996. As such, I can only give some ideas on troubleshooting.

1. First a question: is the temp sensor in question the one at the transmission end of the cylinder head? On my car, this sensor is fairly out in the open and a normal closed box wrench should have access. The sensors are usually made of brass, so they should come out fairly easily - however brass is also soft, so be careful.

2. While I am fairly sure that the sensor that feeds the ECU is a Negative Temperature Coefficient (NTC) sensor, I'm not sure about the one that goes to the gauge. If the fans run when the wire is disconnected (infinite resistance) and this is the way that it is supposed to operate, then the sensor may not be NCT. What is the resistance measurement when the engine is cold? What about when the engine is hot?

3. For the later 9000s, the temp gauge is buffered by the EDU, meaning that once warmed up the needle will stay at about 8:45 until it is about ready to overheat. Rumor has it that this was meant to calm drivers who got alarmed at the large swings of the temperature gauge needle on the earlier cars. Moral: you can't tell much from the gauge other than it is getting some input (vs. no input at all) from the temp sensor.



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