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This might be a stupid question, I have a 2006 LS (no mods) and just replaced my thermostat. During the summer my temp never got over 205 and now just idling for leaks it got to 230. Could it be I have not added coolant from when I "lost" it getting to the thermostat? I did not seem to lose a lot but its possible.
 

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On your reservoir, where is the fluid at on the indicator... Also, keep in mind it is possible your thermostat could be going bad, and also is your coolant due for a change
 

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Its a new thermostat and I know I lost coolant when I pulled off the lower radiator hose, I just bought some antifreeze/coolant and will be filling my car when it totally cools down
 

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230 is too high. Add coolant to fill line, run engine until fans start then shut it down and recheck and refill to line. You might have an air lock so you might have to do this a few times. 190-195 is normal. Fan should start around 195 and bring temps down to about 188 before shutting down.
 

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I noticed these cars and cavies like to run hot as crap if idling. I had a 07 LT for a week and had to go back to the dealer because they were trying to mess with my terms and such and while waiting in the parking lot it got up to 220. Ended up telling them to take it back due to financing BS. I later got an LS and that got up to 215 one time. Thats when i learned to flip on the a/c when extended idling because the fans never kicked on unless I did that. My 03 cavalier was the same way. The fan only came on that when it was real hot after I shut the car down.
 
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