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I live in Arizona, and our summers are very hot, around 110-115 degrees! I've owned this C5 for almost 3 years. And every summer I run into overheating. I have not been able to figure out the problem. Coolant levels are always perfect, relays checked out, both fans come on and they seem to change speeds at the right temperature. I keep the air filter clean and it is a cold air intake system. Most day I can't even make it home; which is about a 20 minute trip "in town," before it reaches 230 degrees. It even runs that hot on an open freeway. During the winter here (if you want to call it a winter), it runs perfect, generally about 200-220 degrees. The only thing I haven't changed is the thermostat. I previously had C4 that ran hot as well, very similar issues, and I had changed out the radiator and thermostat on the C4 without improvement. Other than the thermostat, does anyone have any ideas? Anyone else having the same issues with the LS1?
 

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DC PIT CREW BOSS
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Is the radiator and AC condenser clean and free of trash to allow good airflow? Is the radiator clogged internally in any way. Even with good airflow if it is clogged it won't cool efficiently. just a few thing to think about
 

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They are. I haven't had the radiator flushed. I was wondering about "burping" the radiator. And reservations about trying that?
 

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Dewitts Radiator. Two core , Aluminum, Give them a call and they will discuss what you need. Sounds like your fans are fine.
 

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the punisher

I would imagine living in Arizona you would get a lot more sand and dust debris in your radiator and condensor. May want to have it thoroughly cleaned.
 

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For $167.00 in ebay I got a aluminium two row radiator and with some easy mods it fit great. I live near 29 Palms with temps near your and with the ac on I run 199 to 207. Stock fans and stock thermostat.
 
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