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temp gauge issue

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  #1  
Old 1 Week Ago
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Icon5 temp gauge issue

I recently got my fourth Ranger a 1999 3.0 manual with 83K. I see the temp gauge will only move from the C line to the first line of the arc. This makes me very nervous as I've had a couple radiators blow before and toast the head gasket in minutes. Anyway I'm hoping someone has seen this same issue or can advise on where I should start.
Thanks in advance.
 
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First thing would be to replace thermostat, someone may have put in a 160 or 180degF t-stat, 190-195degF is spec

Every few years Ford changed the gauges, so "only move from the C line to the first line of the arc" is only usable to someone with exactly the same gauge
Try 1/4, 1/3, 1/2, ect.....as description
Between Cold and Hot would be 1/2 way and an estimate is good enough from that, and no "letters", Ford also like to put N O R M A L on their gauge faces, and they are spaced differently over the years

With 192degF thermostat temp gauge usually runs just below 1/2 after warm up, and then will go just above 1/2 when climbing a long grade or pulling a trailer, Ford usually had 200degF as 1/2
3/4 is bottom end of over heating so reduce the engine load and pull over, but don't shut off engine if temp gauge starts to drop, raise idle a bit to get more coolant circulation until temp gets lower, then you can shut it off.
When you shut off a hot engine all circulation of coolant stops, so the hottest areas, the heads, have no way to bleed off heat, so get supper hot, and that blows head gaskets and cracks heads
Obviously if a hose or radiator blows all coolant is lost so shut off engine ASAP
 
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I'll replace the thermostat and report back. In the meantime here's a pic showing the movement I described. My needle sits in the same place at operating temp as in the pic. Starts at the C and only moves to the first line.
Thanks for the fast response I appreciate your time.
 
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That about an 1/8, so gauge IS getting a signal from Temp Sender on the engine, but coolant is not getting hot enough
1/8 is probably about 120-140degF, feel upper rad hose to confirm low temp, if you can hold you hand on the hose then gauge/sender are accurate, it its HOT then could be sender is failing

Fuel injected engines have TWO temp devices on the engine
ECT sensor, for computer only
Temp Sender, for gauge only
 
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