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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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The missing relay is for the super charged engine or LSJ, which you don't have. All is normal.

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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