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post #1 of 4 (permalink) Old 03-15-2018, 01:01 PM Thread Starter
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Overheating Issues

I have a 2007 Chevy Cobalt LS 2.2L that is overheating. We had the engine built and the temp was getting high, at around 220-230. Took the engine back to the builders and got engine back. Engine started to shoot oil out exhaust. The builders didn't want nothing to do was the motor. So I found a good deal for a low mileage motor. Got it installed, runs great but I still dealing with the same problem, overheating. Everything on the cooling system was replace. Radiator, water pump, thermostat, cap. I even took it to the dealer and they can't figure it out but replaced the thermostat. They did unhook exhaust system see if it was back feeding and it seems that maybe the problem. But after replace the exhaust system still overheats. Any info can help. Thanks
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post #2 of 4 (permalink) Old 03-15-2018, 01:57 PM
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your fans working? any pinches in the coolant line?
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post #3 of 4 (permalink) Old 03-16-2018, 04:27 PM Thread Starter
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Yes fan works and hoses look good
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post #4 of 4 (permalink) Old 03-16-2018, 06:58 PM
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Normal is 89C (192F) on average . Can get higher in stop and go traffic. According to specification you're still in range.

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

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

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

• After the vehicle is shut off, the ECT at key-off is greater than 140C (284F) 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 110C (230F).

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

• When certain DTCs set

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Last edited by Coby7; 03-16-2018 at 07:00 PM.
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coolant , cooling , cooling system , overheat , overheating

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