SOURCE: 97 Cavalier engine coolant light.
have you changed the sensor on the coolant reservoir? try that.
SOURCE: COBALT TEMP GAUGE READS 250 DEGREES BUT ENGINE
Probably the temp gauge itself. Most of the time it doesn't have a problem but sometimes they do go bad. Did the car ever overheat prior to changing the solenoid?
SOURCE: 2007 Chevy Cobalt with p0128 and "---" temp reading
The P0218 Code is primarily intended to indicate a faulty thermostat.
Have the thermostat replaced
Other possible causes that could trigger this code would be:
Low engine coolant level
faulty cooling fan
faulty coolant temperature sensor
faulty intake air temperature sensor
SOURCE: antifreeze ts boiling back into reservoir.
it sounds like a possible head gasket problem,you can get the fluctuation from combustion gases getting pumped into your cooling system and creating gas pockets,i would suggest taking it to a shop and have them do a block test to look for combustion in the cooling system to confirm the problem,that way you will know for sure,if it comes up negative they can also perform a flow test to make sure there is no restriction in the cooling system such as a plugged radiator or a bad thermostat,hope this sheds a little light on it
Testimonial: "I bet you've hit on the problem ! Car has been "using " antifreeze for a couple years now, with no leaking anywhere. Lost through the head gasket ?"
SOURCE: is it hard to change a thermostat in 2005
no not hard to do, just make sure you get all the air out of the system,if you need more help get back to me Thanks Ray
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