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Old Mar 27, 2018 | 07:14 PM
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got 04 c5 cooling fans arent working right got low fan and replaced 44 relay still no high cant drive it on the interstate it will stat over heating so i disconected the battery and let it sit for 5 mins or so hocked it back up in the drive way and let it run for about 8 mins low fan comes on not high fan when it starts over heating
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Old Mar 27, 2018 | 07:51 PM
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Fans should not come on with A/C off until it hits 226 degrees. Driving on the interstate it should not overheat with the fans off.
Fans will come on with A/C on at 185 degrees. High speed fan at 194.

Last edited by JR-01; Mar 27, 2018 at 07:53 PM.
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Old Mar 27, 2018 | 08:37 PM
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What is your definition of overheating? As soon as you get over 30 mph, the fans should shut off and not even factor into the cooling.
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Old Mar 27, 2018 | 08:50 PM
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Sounds like you have a different cooling issue OTHER than the fans..
At highway speeds, you would rarely see fans come on, unless you are driving
it really really hard AND the temp outside is like over 90*...
maybe you have air in the system/ low on coolant/ trash in front of radiator/ coolant temp
sending unit Bad, Etc
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Old Mar 27, 2018 | 09:06 PM
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Moved to C5 Tech.
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Old Mar 30, 2018 | 12:18 PM
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Originally Posted by 04vette007
got 04 c5 cooling fans arent working right got low fan and replaced 44 relay still no high cant drive it on the interstate it will stat over heating so i disconected the battery and let it sit for 5 mins or so hocked it back up in the drive way and let it run for about 8 mins low fan comes on not high fan when it starts over heating
What temperature are you calling "overheating"? Normal range is around 196 - 227.
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Old Mar 30, 2018 | 12:20 PM
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Are you still here?
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