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If your coolant level is fine , it sounds like your thermostat is sticking open

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Q: Temp gauge reads cold no hot air 2002 f-150?
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What does it mean when your coolant temperature gauge reads cold even when warm and the idle is high?

Low Coolant or faulty gauge


What could be wrong if temp gauge reads cold and heater blows cold air on ford windstar?

I'm not a mechanic / technician but it sounds like your engine cooling thermostat is sticking open ( assuming that the electric engine cooling fans are not running continuously )


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This is a quote from a popular auto repair book:"It is rare for the temperature gauge to fail,but if it is erratic in operation check the lead from the (temp. sensor) switch for broken insulation and earthing.If the gauge reads maximum,suspect the sender switch(temp. sensor)." The switch can only be tested with an ohm meter or by substitution of a new unit.I just replaced my tem. switch and it didn't fix my gauge!So...


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The temp sending unit on the engine could be unplugged or faulty.


How do you tell when a car thermostat is bad?

Stuck open - no heat from heater, temp gauge hardly moves off of cold. Stuck closed - overheats engine, temp gauge quickly climbs to hot.


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There are 2 coolant temp devices on your 91 k1500 5.7L The single wire one switch that screws into the head what values does it have is it just a switch to ground what devices use its output signal?

== == The one in the head is for water temp. It works the temp. gauge in the dash only. The one in the intake tells the computer to richen or lean the fuel. It does not have a choke to richen the fuel up when it's cold. It reads water temp. Hey I'm cold I need more fuel, so I can start.


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Mazada 626 temp gauge jumps?

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Why is the gauge stays on cold and does not move up even the engine has sufficiently warmed up?

The temp sending unit or gauge is bad, probably the sending unit.