JETninja

These cars are bottom feeders, so they suck up a lot of debris. If you have a compressor, use a Pik and blow out all of the debris twice a year.

Bill Dearborn

228 on a LS engine is not a problem. Coolant temps can easily get close to 250 degrees on hot days when the cars are pushed hard in a 1 minute long autocross.

The GM service manual states the following:
"The low speed cooling fan is commanded on when the coolant temperature reaches 108°C (226°F). It is turned off if the coolant temperature lowers to 104°C (219°F). The high speed cooling fan is commanded on when the coolant temperature reaches 113°C (235°F). It is turned off if the coolant temperature lowers to 108°C (226°F). When the A/C is on and the coolant temperature reaches 85°C (185°F), the low speed cooling fan will be turned on at vehicle speeds less than 56 kPh (35 mph)."

We aren't living in the 60s, 70s or 80s anymore and engines run just fine at higher coolant temps.

Bill

Z06 Zephyr

^ I agree with this post. I'd say mine's normally around 182-205 in all conditions. My fans are set turn on early.

63Corvette

All true, BUT........if you are siting in traffic while showing high water temperatures like 240, then you should also turn on your gages to show OIL temperature, and watch your oil pressure. While sitting in traffic on I35 in Texas August heat, I saw water temps of 240 or so, along with OIL temperatures over 280 F and falling oil pressure (at idle) to less than 30psi, so it "could" lead to other issues, although my temperatues and OP all returned to normal and stabilized after my road speed returned to normal.