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post #1 of 5 (permalink) Old 10-23-2018, 07:04 AM Thread Starter
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Coolant Questions

I'm new to the group and am somewhat confused on the coolant fan subject. I read its a low/ high fan scenario with the cobalt. I have one fan and I have replaced the coolant fan relay 1 and 2(just in case), fuses are good and the outcome is still the same. Runs up to 195 average temp on the road and Idles up to high temps and now kicks on around that 217 mark. I guess I'm old school when it comes to these coolant temps they run so high now days. Is this normal? Is the one fan dual speed?? I don't seam to have a low fan running at 185 as some say I should. Very mixed messages on the web resources I have viewed. Thanks in advance for any clarification in this issue.
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post #2 of 5 (permalink) Old 10-23-2018, 07:36 AM
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One fan 2 speeds...


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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post #3 of 5 (permalink) Old 10-23-2018, 08:40 AM Thread Starter
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coolant question

So should there be a low speed fan come on prior to the car reaching a 223F. If the normal operating temp is 192F shouldnt the fan come on closer to that temp to keep it running cooler? My fan switches on @ 217. Where should it be coming on..or why isnt it? That is the question. Lol
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post #4 of 5 (permalink) Old 10-23-2018, 09:54 AM
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Low speed at 223 and high speed at 230, the thermostat is suppose to take care of the rest.

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post #5 of 5 (permalink) Old 10-23-2018, 10:01 AM Thread Starter
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Cool simple answer. thanks

Last edited by berrypw; 10-23-2018 at 11:04 AM.
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