2007 Chevy Cobalt coolant temperature sensor

Tiny
SAMMS21
  • 2007 CHEVROLET COBALT

Engine Cooling problem
2007 Chevy Cobalt 4 cyl Front Wheel Drive Automatic

I have a 2007 Chevy cobalt LS with a 2.2 liter ecotec engine, I am having problems with the coolant temperature sensor. I have replaced the sensor twice already and it continues to act up. It will not read when the outside temperature is below 60 degrees Fahrenheit. If I start it from a cold start then drive for a few miles it will read up to 170FÂ ° then it will hover around 165 to 170 then it will get stuck on a random temperature in between Then it will read ---FÂ ° followed by the radiator fan coming on and running constantly. After all of this happens the engine light will come on after a few more miles. Can someone please help me?

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Thursday, September 30th, 2010 AT 8:18 PM

14 Replies

Tiny
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When you replaced the sensor both times did it ever fix the issue?

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Thursday, September 30th, 2010 AT 8:21 PM
Tiny
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No it never fixed the problem I thought I just purchased a faulty sensor but it continued with the same problem

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Thursday, September 30th, 2010 AT 8:35 PM
Tiny
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What type of coolant are you using in system or has it ever been replaced?

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Thursday, September 30th, 2010 AT 8:51 PM
Tiny
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Coolant has never been replaced, it is the factory orange colored dextron

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Thursday, September 30th, 2010 AT 8:53 PM
Tiny
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Did more research and it seems to be a common issue with these Cobalts, although I am not finding a solution, however I have found that replacing the coolant sensor and replacing the computer has NOT fixed the issue in the past. Replacing the thermostat is what I am leaning towards, the tstat is around 20 bucks new and rather simple to replace.

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Thursday, September 30th, 2010 AT 9:03 PM
Tiny
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Thank you for your help even if the thermostat is not the problem I am willing to risk 20 dollars.

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Thursday, September 30th, 2010 AT 9:13 PM
Tiny
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Yes, normally I don't throw stuff out there but the engine coolant reading is fairly simple set up and from all the research I read online and from what you have described it really leans me to the tstat. Let me know how it goes and if you need steps on replacing the tstat I can get those as well

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Thursday, September 30th, 2010 AT 9:15 PM
Tiny
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Not exactly sure where the thermostat is on my car I was once told to follow the upper radiator hose and it should be at the end of that.

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Thursday, September 30th, 2010 AT 9:28 PM
Tiny
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The thermostat is located behind the engine under the exaust manifold on the drivers side. Just look for the water pump tube and you will find it.

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Thursday, September 30th, 2010 AT 9:31 PM
Tiny
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Is eat easy to replace? Just unbolt and put the new one in or is it more complicated.

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Thursday, September 30th, 2010 AT 9:34 PM

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