Question about 1983 Ford Econoline

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Teampreature gauge not working

The temp gauge on my ford econovan is not working, i replaced the temp switch on the thermostat and it still dosent work, i also earthed the wire going onto the switch an the gauge goes up so the wiring is ok.. anybody got any ideas??

Posted by ndt777 on

  • Anonymous May 11, 2010

    you may have a temp sender unit that's for a light and not for a guage... if this is the case, the sender unit will reach the set temp and allow the circuit to close all at once... instead of slowly increasing which would allow the guage to climb with the temp...



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John Bloomfield

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Sounds like you have installed a 'over-temperature switch' type sender unit- this type of sensor is only meant to control an over-temperature alarm indicator lamp that is either 'on' or 'off'.

The temperature gauge requires a 'variable resistance type' temperarure sensor to control the meter deflection.
When cold the temperature sensor is of high resistance, hence less meter deflection;
when hot temperature sensor is of low resistance, hence more meter deflection.

You need to procure a matching sensor to suit the type of gauge installed.

Is it possible you have connected to the temperature wrong temperature sensor? - most vehicles are fitted with both a gauge type (variable resistance) sensor to drive the temperature gauge, as well as a switch type (on or off) sensor to drive the overtemp indicator light.

Posted on Jun 03, 2009

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Hi Ivette,

Temp sensor/sender units, ussually send a variable earth resistance dependent on temperature, so it sounds like the wiring is broken/rubbed through, causing the sporadic changes due to full earth going to gauge(hot). brocken wire(cold)

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