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My 2010 Chevy Cobalt LS coupe have 196.000 miles ,run great but here in Los Angeles is hot ,yesterday start to go the colling from 219 to 235 to 240 usually don't go over 221 ,my question is 240 is safe or is to high..this is driving in traffic on street for a few miles no more of 10 miles.....outside temperature are 98 degree.
Do I suppose to worried of is normal ,I did a flush at 150.000 with the right coiling fluid(red).
Thank you very much if I can get any answer
Frank
 

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My electric fans use to kick in at 210 but not sure what temp it has to get to now to kick on. My car got close to 300 idling in the driveway before. This caused the car to overheat so bad that steam was coming from the overflow. This is why I have hooked up a bypass for the electric fans and constantly monitor the temp. Once it gets around 210 i flip the switch.
 

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Normal is 89°C (192°F).

Here are the specifications.
The ECM commands Low Speed Fans ON under the following conditions:

• Engine coolant temperature (ECT) exceeds approximately 106°C (223°F).

• A/C refrigerant pressure exceeds 1 310 kPa (190 psi).

• After the vehicle is shut off, the ECT at key-off is greater than 140°C (284°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.

The ECM commands High Speed Fans ON under the following conditions:

• ECT reaches 110°C (230°F).

• A/C refrigerant pressure exceeds 1 655 kPa (240 psi).

• When certain DTCs set
 
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