Question about 1993 Ford Ranger SuperCab

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Heater is blowing luke warm heat

The inside temp. gauge goes from normal to low. The heater is going from hot to luke warm. 1993 Ford Ranger 3 liter 4X4

I have replaced the Thermostat already.

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  • djb1sab Jan 24, 2009

    When engine is cold the temp gauge is low and fan is always running never stops. After engine is hot the gauge will go from normal operational range to low with the temp going from hot to luke warm. The inside temp slide is set to the maximum for hot heat. The fan never stops running.

  • djb1sab Jan 24, 2009

    Motor 1258



    Everything is the same whether in the defrost mode or the heat.

  • djb1sab Jan 24, 2009

    Motor 1258



    Fan never stop running while in the heat or defrost position. Also when I slide the temp lever to cold the inside cabin area goes cold just like the switch reads.

  • djb1sab Jan 24, 2009

    Motor 1258, I checkedthe power distribution panel underhood for radiator fan relay. I found a/c Wot relay, Fuel pump relay and E E C Power relay. Removed all three one at a time. The fan blower did not stop. The rest were fuses listed as following EEC power,Fuse pnl, elec shift,fuse pnl, and 60 ign.

  • djb1sab Jan 24, 2009

    Yes, One reads EEC Test. The other one I unplugged and fan motor keep running.

  • djb1sab Jan 24, 2009

    Should I be checking that and if so what am I checking for.

  • Mike Butler
    Mike Butler May 11, 2010

    Check your rad fan operation, is it staying on all the time when engine running? How does it react with temp gauge, for example, does it come on before temperature says normal? Shut off only when it hits cool, or low on gauge?

  • Anonymous Mar 25, 2014

    overheating. replaced thermostat. radiator and reservoir holding water and heater blows hot. running heat was keeping it in normal range but this morning it red lined with heater blowing full blast

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  • Ford Master
  • 6,674 Answers

Double checking, does fun shut off when switched to heat instead of defrost?

Posted on Jan 24, 2009

  • 3 more comments 
  • Mike Butler
    Mike Butler Jan 24, 2009

    Check power distribution panel under hood for rad fan relay. Give it a tap with handle of screwdriver when gauge reads cool, and see if rad fan shuts off, or remove it, and see if it goes off to confirm you have correct relay.

  • Mike Butler
    Mike Butler Jan 24, 2009

    What did you find?

  • Mike Butler
    Mike Butler Jan 24, 2009

    Does yours by chance have any electrical connections on side or back of rad, ? I'll do some checking.

  • Mike Butler
    Mike Butler Jan 24, 2009

    Coolant temperature switch must control that. Front of engine near coolant outlet.

  • Mike Butler
    Mike Butler Jan 24, 2009

    Here's a link for testing that sender/switch.

    http://www.autozone.com/shopping/repairG...


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