probably means u need to change the coolant for the car,leaking coolant sumwhere
your coolant is low.......this happens when you are idle and then once you start moving it goes down......fill your coolant to the top and itl fix this problem
Check/replace the thermostat.
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.
Temperature
If you temperature gauge is going up and down then you may have a problem with your sensor. You should take your car to a professional to ensure that you don't overheat your car.
This fluctuation is caused by common use. The temperature will be higher when the vehicle is idling because there is no air moving over the engine like it does when the car is in motion.
Because when your moving, air is moving at the radiator, cooling it down, thus cooling your coolant down, thus cooling your motor temperature down causing the coolant temperature sensor to pick up a lower reading and relaying it to the gauge. Depending on how high it is in "Park" you may have poor circulation, a broken or missing fan shroud, weak water pump impellers, low coolant, inactive coolant fans or a bad fan clutch.
Sounds like the thermostat is sluggish to react to temperature changes
turn your temperature gauge down. it should be around 3 or 4 I believe.
Thermostat probably needs to be replaced.
Temperature
because the engine in that car does not cool down