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Thread: Cooling fans no blow

  1. #1
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    Cooling fans no blow

    On Sis in law's 1998 protege with 1.5L DOHC engine. The fan does run when AC is on, but do not run otherwise, even when the engine is approaching over temperature.

    Sis in law replaced fan relay in fuse box on LH side of engine bay. There is +12 at one side of the relay coil, and +12 at common of relay throw. Energizing relay coil on bench throws relay.

    The engine coolant temperature sensor is replaced, before replacement engine temperature gauge did not move, now it warms up rapidly.

    This car does have two radiator/condenser cooling fans, I'm not sure which/both should run on engine temperature, and which/both should run on AC on.

    Thank you so much for any wisdom here. This is one of those jobs where compensation is good will/love, so we've got that going.
    Last edited by Slim; 01-22-2018 at 11:02 AM.

  2. #2
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    Oops, my problem looks a lot like this one: http://www.clubprotege.com/forum/sho...ns-not-working

  3. #3
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    Can anyone say if PCM error codes will indicate which if not both O2 sensors are fouled? It would be good to know which if not both are malfunctioning. Thanks in advance....!

  4. #4
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    Update - after new water pump, new radiator, new T stat, new T sensor/sender, new hoses, car starts, temperature gauge reaches Hot very quickly. T stat opens only when gauge is reading H.
    Top tank is quite hot to touch, lower tank is cool to touch with fans running.

    Looks like gauge is reading high, car does not seem hot, with radiator cap off coolant flow is observed, no boiling over etc. Sender is AZ cheapie. Are there multiple sender applications for this car? Anyone had issues with T gauge reading high?

  5. #5
    suspension mods intheworks FE3-323's Avatar
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    i would get the right sender from the junkyard. or mazda OE
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