Low coolant level and possible coolant leak.
Your temp. sensor might be faulty, or the wiring for the gauge, but 9 out of 10 times this indicates air in the cooling system. Check the overflow tank. When there is HOT coolant on the sensor, it pops up. When air hits the sensor, it dives down.
A salamander is a cold blooded animal. So it simply follows the temperature change. Temperature goes down, its body temp goes down, Temp goes up its body temp goes up
the rise to 190 is normal. the reason for the drop in temp. is the cooling fan is doing its job, i wouldn't worry about that unless it overheates.
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the temp goes down, the winds go up, and the pressure goes up...
It is normal for a temperature gauge to go up a little bit until the thermostat opens up and the cooling fan comes on. As long as it is not going out of the normal temperature range it is fine.
A faulty thermostat might cause the temp gauge on the 2000 Nissan Altima to raise to hot when the car is not overheating. A faulty thermostat can cause the gauge to move up and down and might even turn the fan on.
The temperature gauge on a car fluctuates because the car's thermostat is opening and closing. The gauge goes up when the thermostat closes and the gauge goes down when the thermostat opens.
A malfunctioning thermostat can cause your temperature gauge to go up and then allow the gauge to go all the way down. When the thermostat is stuck closed, your engine will overheat and water will not get to your heater core. When the thermostat opens the engine cools down and water flows to the heater core.
The temp may not go up until the antifreeze leaks way down. Or the temp gauge may not be working right. The leak needs to be fixed, or the engine can overheat and cause permanent damage.
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