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Fans not kicking on

This is a discussion on Fans not kicking on within the General Help forums, part of the LSx Technical Help Section category; Picked up a 98 z28 and am having an issue keeping the car cool. Main problem is the fans don't ...

  1. #1
    Senior Member tatertot91's Avatar
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    Fans not kicking on

    Picked up a 98 z28 and am having an issue keeping the car cool. Main problem is the fans don't seem to kick on. Hooked up HPtuners to it and i can manually turn them on but they don't want to come on by themselves. Coolant temp reads fine so i'm thinking PCM. Anybody have any ideas before i go out and pick up a new computer?


    Just to be on the safe side i'll be installing a new water pump and radiator but the fans are still my main problem.

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    expensive tires az gt eater's Avatar
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    Senior Member tatertot91's Avatar
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    Sunset Orange Metalic
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    Slightly different issue. What stumps me is the fans work and i can turn them on manually, but they should come on by water temp automatically. And the fact that they do work leads me to believe it isn't a wiring issue.

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    Smiles for 9.5 Years cammed goat's Avatar
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    Have you checked the temp sensor in the head to see if it's bad?

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    Senior Member tatertot91's Avatar
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    Sunset Orange Metalic
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    Temps read fine. I think what happened was i didn't get the car hot enough for the fans to kick on. I think the stock fan setting is about 225-226, i only let the car hit 224 and killed it. 226 seems high but i'll try and get her up to temps tomorrow and hopefully the fans kick on. AC doesn't work so the fan doesn't kick on with it on.

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    Yeah baby! Yeah! silverWS6's Avatar
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    Can you set the fans to come on before like at 200 so you wont have to let it get to 226?

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    Moderator 35th-ANV-SS's Avatar
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    The PCM will command low speed fans ON at 108C (226F) and OFF at 103C (217F) and, high speed fans ON at 113C (235F) and OFF at 108C (226F).

    Pretty sure that's correct.
    It's on jackstands.

  8. #8
    Senior Member tatertot91's Avatar
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    Yep Jon, think thats about right. I got it to 224 last time and thought it was high enough but i guess not.
    And i might drop the temps but want to be %100 sure i'm keeping it before i use up some hp tuners credits.

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