Temp gauge readings

Discussion in 'General Motoring' started by Art*, Feb 4, 2004.

  1. Art*

    Art* Guest

    How high can the temprature gauge go without the car over heating?
    I have a 93 SC2, and usually run the A/C when I see the temperature gauge
    get a little more than half way on the gauge, just to turn the cooling fan
    on just to bring the temperature down. This happens when I'm stuck in
    traffic.

    If I don't do this, the guage keeps climbing. Today I just let it get
    about just before the red area, then switched the A/C to cool the car
    down.

    When should the fan come on without me needing to turn on the A/C? I'm
    afraid if I just let the temperature climb without doing anything, the fan
    will never switch on.
     
    Art*, Feb 4, 2004
    #1
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  2. Art*

    Mike Martin Guest

    There are 2 sensors on this car. One for the gauge, and another for control.
    The control feed the PCM to control both rad fan and fuel injector pulse
    width based on coolant temp. It seems that is not that uncommon for the
    control sensor to go bad. Even though your gage goes up, it is possible the
    PCM always sees a cool engine temp.
     
    Mike Martin, Feb 4, 2004
    #2
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  3. Art*

    Lane Guest

    Lane, Feb 4, 2004
    #3
  4. Art*

    GoAwAy669 Guest

    It's perfectly normal for the engine temp to get a hiar abouve the three
    quarter mark. At that point, the cooling fan kicks in until the temp is back
    down around the quarter mark.
    Your engine is going to heat up in traffic because there's no air hitting your
    radiator, cooling it down.
    If the cooling fan does NOT kick in when it starts to tip towards the very edge
    of the red, I'd suggest getting the cooling fan relay checked - it might be bad
    if you have to turn the fan on maually.
     
    GoAwAy669, Feb 12, 2004
    #4
  5. My 97's gage was like that when new, and then when a temp sensor was
    replaced the point where the fan kicks in is at the halfway mark. Whether
    it was the sensor alone or a PCM flash (updated EPROM programming) I don't
    remember.
     
    Jonnie Santos, Feb 13, 2004
    #5
  6. Art*

    Kirk Kohnen Guest

    Guys,

    The radiator fan motor is a DC motor that uses brushes. It is a wear item!
    It's also a sealed motor (no brush replacement caps) so you have to simply
    replace the whole motor when it dies. While the relay can also wear out,
    this is far less common than fan motors wearing out.

    So, if your temperature is going too high, check to see if the fan is
    working.

    If the fan is not working, suspect the fan motor first.
     
    Kirk Kohnen, Feb 14, 2004
    #6
  7. Art*

    Woobie Guest

    Had same problem. It's not supposed to go to 3/4ths then have the fan kick
    on. Mine kicks on just beyond half after I fixed it. Service manager
    confirms that sensors get green corrosion on them (I think it's brass or
    copper,) and the line to the fan corroded as well. This stops it from
    kicking on because the corrosion causes it to short. Bought a new line and
    sensor and all is well.
    Joe
     
    Woobie, Feb 29, 2004
    #7
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