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post #1 of 4 (permalink) Old 01-02-2016, 08:36 AM Thread Starter
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How HOT Should My Cobalt Get?

My 05 LS 2.2l got up to 215 yesterday without the cooling fans kicking on. Is this normal? If it is then when should the fans kick on? I noticed in the under hood fuse/relay box that the relay labeled "COOL SER/PAR" (red arrow) is missing. Do I need this relay to run the cooling fans?

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post #2 of 4 (permalink) Old 01-02-2016, 08:42 AM
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The missing relay is for the super charged engine or LSJ, which you don't have. All is normal.

Normal is 89C (192F).

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; 01-02-2016 at 08:50 AM.
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post #3 of 4 (permalink) Old 01-07-2016, 03:49 PM
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I've gotten mine up in the area of 230-234 with no problems, and still no problems 6 years later so don't even sweat it

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post #4 of 4 (permalink) Old 01-07-2016, 04:52 PM
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sometimes in traffic I will see 217 - 220. Once i start moving again or kick on the AC, the car cools down.
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