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Moved to C7 Tech for some assistance.
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Joined: Oct 2007
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From: So. Cal.
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You have a lazy thermostat. Rock Auto has OEM thermostats.. This also happened to me. Pretty easy change out. you won't lose to much fluid.
Drifting
Joined: Feb 2005
Posts: 1,445
Likes: 173
From: San Jose Ca
definite lazy thermostat. The sensor is most likely fine. Change the tstat, and if the coolant is over five years, now is a good time to change it also. Disconnecting the negative battery terminal will reset the fault, such as it is. There will be no codes present.
Race Director
Joined: Apr 2000
Posts: 15,344
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From: Texas
Define "temp gauge not working". It literally doesn't budge off the 100* or whatever the low reading is or the temp never exceeds "xxx degrees" . If the former, check the sensor plug and test the sensor. If the latter, it's the thermostat.
Drifting
Joined: Feb 2005
Posts: 1,445
Likes: 173
From: San Jose Ca
A lazy or stuck open tstat problem will have as a symptom a zero reading on the digital performance screen, and the analog temp needle will stay at the lowest position. The fans will turn on full blast at shutdown, and at cold start.
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Race Director
Joined: Apr 2000
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From: Texas
You believe what you want and have him toss parts at it rather than performing some basic troubleshooting
Drifting
Joined: Feb 2005
Posts: 1,445
Likes: 173
From: San Jose Ca
Its true that the engine will still warm up based on load, outside temp, etc. I'm only advocating changing the tstat as thats been shown many times to be the culprit. It was in my case too. The sensor is easy to check with an ohm meter so no need to "toss parts" in place of troubleshooting.