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Temperature Fluctuation simply
StUck in open position
change in temperature causes change in pressure
Temperature.
The temperature sensor is probably bad
Loose connection or blown sensor !
bad temp sender usually. Bad gauge rarely.
Could be the coolant temperature sensor.
Urine is the same temperature as the body it leaves. If the person has a fever, the urine will be a higher temperature. This is why there is a temperature gauge on the outside of a sample bottle.
Bad Gauge---Electrical short---Bad fuse---Bad sending unit---loose or bad electrical connector to the gauge. Bad sensor. Had a faulty gauge on my 97 Ford Ranger. I changed the thermostat and the sending unit and the temperature sensor it started wotking beautifully.
change the temp switch first and if its the same as before then someone has taken the thermostat out which causes the engine to stay cool.
Bad groung and or bad sending unit.