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Discussion Starter #1
Three days ago, while on my way to work, I noticed that my temp gauge read cold the entire way to work. The needle didn't move at all. When I left for lunch it worked fine and has worked perfectly until this morning. Again, on my way to work, the needle never moved reading flat cold the entire time. The heater blows hot air so the engine is getting warm. My fear is that without the correct temp registering, the fans will not engage and my engine might overheat. I cant let that happen. There has been no error messages on the DIC and the check engine light has not come on. My reflex is to replace the coolant temp sensor. Has anybody experienced this and if so did a new sensor fix the problem? Also, does anybody know the specific location of the temp sensor on this car? My thanks to the entire community.
 

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2011 DTS Platinum
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4,633 Posts
I don't know the EXACT location of the sensor... but...
I think the first thing I would do is check the wire connection "ON" the sensor... (after finding the sensor, of course)
It may be slightly loose.. just enough to cause an intermittent connection.

Jim
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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The coolant temp sensor is threaded into the rear (passenger side) of the right (firewall side) cylinder head. A bit of a PITA to reach.
 

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2006 DTS
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Phigment, my 06 DTS was doing exactly the same thing... about a month ago every once in a while I would notice the temperature gauge was all the way cold, then the next day it would be right in the middle like it always is. One day I was driving and happened to catch the gauge going from cold to hot in a couple seconds. It went so fast that I thought it must be the temp sensor (but I was wrong).

I went and replaced the temperature sensor, which, as others have correctly noted, is a total PITA to reach. Mine is threaded into the driver side of the block by the rear left cylinder. Another user described it as being above where your right foot toes would be on the gas pedal, and that is pretty close. That is probably all irrelevant info however, because replacing the temp sensor did nothing. So, I replaced the thermostat and the temp gauge is working just fine now. Thermostat is less than 20 bucks and easy to do - the two bolts and hose are easily accessible.
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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A faulty thermostat would not cause the gauge to stay at full cold.
 

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2006 DTS
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16 Posts
my coolant temp gauge stooped working, turns out some sort of animal had chewed through the wires near the temp sensor; bought a new wire and connector and I'm good to go. You might just check the connection at the block and the wire itself. You have to reach through the master cylinder area but it is reachable from the top. :)
 

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Discussion Starter #10
Thought I would report back on this problem. I did replace the temp sensor and the problem has not returned. The wires did not "appear" to be damaged. Thanks all.
 
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