08 Cobolt running hot


Asked by Dec 07, 2015 at 12:46 PM about the 2008 Chevrolet Cobalt SS Coupe

Question type: Maintenance & Repair

6 months ago I suspected my cobalt had a
small head gasket leak due to low coolant
and some/little white smoke. I added some
expensive stop leak by manufacturers
directions and my issues went away. I've
constantly monitored my temp and it ran
from 190-205 till now. It gets up to 220-225
or hotter unless you turn the heat off and the
temperature drops below 210. I have no
coolant loss and changed the thermostat
and still have same issue.  Temp actually got
up to 240 until I turned heat off. Fan appears
to be working fine. Any ideas?

5 Answers


Check thermostat sensor


You are on borrowed time. I suspect your radiator is partially plugged up and that you may need a new thermostat. What kind of stop leak did you use?


Changed thermostat. Can't remember the name of stop leak bought it off internet for about $90. Why does turning off fan for heat make it cool down


Thanks for your help guys. I changed temp sensor and all is well. Running between 190-200f. The temp does increase a little when I turn on the heat but nothing like before. Thanks again.


Sorry guys I spoke to soon. Went back to running hot. Ran into an old friend that runs a shop and told me to bring it in he thought it might be electrical. He found that my heater core was plugged severely but was able to flush it out. So far so good

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