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In the most general of terms a diesel engine would operate at 86-92 C.
However, much depends on the distance you are driving. On a very short trip(s) your needle is unlikely to get much above cold on the gauge. That's because an engine needs a minimum of 5 miles before the thermostat begins to open to allow coolant to circulate, and 10 miles before your engine is getting to 'normal operating temperature'.
The ideal position of the needle is N - normal ... midway between cold and hot.
If, on a long run, the needle doesn't get much past the cold mark it's probably due to either a faulty coolant sensor temperature sending a wrong reading to the gauge, or a thermostat which is stuck in the open position.
If the needle is indicating too hot - again it could be a faulty temperature sensor, a faulty thermostat - or other problems.
With a fully warmed engine and sitting in traffic/idling your needle would creep from Normal to Hot .. and then the electric fan would kick in.
Jun 25, 2012 - Today I was boiling inside my car as it was a very hot day and my ...cold, it almost never goes up to even 1/4 of the temperature gauge, the ... Where I live, it's hot enough that even with the thermostat wide open the engine won't stay at C.. ... How to Match Skin Color Between Pictures Of The Same Person In ...
Pull off the negative battery cable and unplug the sensor. See if the gauge needle returns to normal. Try tapping on the cluster to unstick the needle. No luck? Replace the temperature gauge.
YOur guage is faulty. Your will need to replace your guage if it stays in the hot position even when your car is off and your key is out of the ignition. If it only rises to hot when you turn the key to the run position, you have a wire between your guage and your temp sending unit that has been gounded out. Usually this happens when a person opens their hood to add oil or perform some minor maintenance on the engine and inadvertantly bumps the sensor or switch or wiring. This causes about 65% of these minor issues people incur, but if it does stay all the way up with your key out of the ignition switch, then you will need to replace your temp guage.
replace the thermostat,, and make sure that the fan engages , just because the fluids don't boil over doesn't mean the temp isn't to high, if your saying that the temp gauge is stuck on the hot setting, and doesn't move even when the car is cold,, thats a different problem,, if thats the case whats the make , model , and year
if the temperature gauge never moves its probably just the coolant temperature sender. Replace that. but i honestly recommend buying a new temperature gauge with more accurate readings. they arent very pricey and they are easy to install
Is the heater nice and hot when the needle shows low temp? If the cooling fans turn on and the heater is hot, that leads me to believe the coolant temperature sensor is bad. You should try replacing that sensor. They are only $6 usd here. As long as your check engine light is not on and your fans are running, this will not hurt your car... but this is something you should fix soon if you can. Make sure the engine is cold when you replace the sensor
check to see if you have voltage at the wire that connects to gauge, then check for continuity on gauge terminals to see if it's ok. almost sounds like it might be the gauge
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