Hey actualy its not that bad my car 2006 cobalt is doing the same . Find the right size socket it will be metric and one of the smaller ones. you will need at a 10" extender for the ratchet as well. make sure car is off drain the fluid and un bolt both bolts. my thermastate was stuck in the top part of the housing and the gasket was half way off. advanced had on for 20.00$ took me about half hour for everything and refill. my car is still over heating i think the computer needs to be reset
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The code means the engine is not reaching normal operating temp. You would need to use a scanner to see what the temp sensor is telling the computer the coolant temp is. If the coolant temp sensor is showing 180 degrees or more after 5 min of run time, the problem could be the computer.
Because you have done so many repairs already I would most likely say that the gauge is defective. I would use a manual temp probe and probe the coolant temp after the car has reached operating temp. Coolant will be between 180- 230 degrees. If coolant temp checks out and you can see coolant moving in radiator and the vehicle does not overheat then you will need either a gauge or a coolant sensor. To locate the sensor it should either be mounted in the thermostat goose neck housing or the intake manifold.
195 degrees is the typical high end on the thermostat (when the thermostat opens), so the temp gauge should read a max of 195 degrees, give or take a few degrees. Some people replace their thermostat with a lower temp one, such as a 180 degree one. Then the gauge will read lower (approx 180 degree max). So the range is typically from cold at start to just under 200 degrees.
I suspect you need a new thermostat. It should be running at 195 degrees F.
If the engine does not fully warm up, the engine can not go into emission control mode.
The engine temperature sensor sends a signal to the engine/emissions computer that the engine is now at normal operating temp. The computer then starts controlling fuel flow, EGR, etc. so that emissions are being controlled.
When the enigne is cold, you are in what we call "open loop" meaning no emission control.
Get the thermostat installed first. Make sure it's the same temp rating as the one that's in there. Either 180 degrees or 195 degrees.