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Thread: 93 Protege radiator fan doesn't turn on and wont start hot

  1. #1
    Registered Member

    93 Mazda Protege DOHC

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    Feb 2019
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    93 Protege radiator fan doesn't turn on and wont start hot

    I have a 93 Protege DOHC. Condition is slightly above being a beater so I don't want to invest a ton of money in this.

    The radiator fan doesn't turn on when it gets hot. I recently replaced the head gasket as well as sensor on radiator (Im told that controls temp gauge on instrument panel) and temperature sending unit on thermostat housing (told that controls radiator fan). As well I changed the thermostat.
    I know the fan works because I hot-wired it to battery and it turned on. I also believe my relay is ok because when I turn on the AC, the fan turns on right away whether engine is cold or hot. If I turn off AC when engine is warm, fan turns off.
    Also, temp gauge on instrument panel always shows cold regardless of engine temp.

    What in the holy-heck am I missing? TIA

  2. #2
    crazy tire guy tireboy's Avatar

    91 323 dx

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    Feb 2008
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    williams lake b.c.
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    There is a temp sensor on the head..one wire hook up..that will be the one you need to replace..

  3. #3
    Registered Member

    93 Mazda Protege DOHC

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    Quote Originally Posted by tireboy View Post
    There is a temp sensor on the head..one wire hook up..that will be the one you need to replace..
    The sensor on the thermostat housing was single wire. Do you mean that one?

  4. #4
    crazy tire guy tireboy's Avatar

    91 323 dx

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    Feb 2008
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    williams lake b.c.
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    55
    Yes

  5. #5
    Registered Member

    93 Mazda Protege DOHC

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    Feb 2019
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    California
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    Thanks for the thought. I already changed it.

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