i think its the guage. but ill let u guys help me come to a conclusion. when i drive the needle moves up n down(slowly) but sometimes it stays in the same spot. when i slow down in pegs red(not always). but when i start goin n drops. so i pull over shut the car off then turn the key to the "on" position and its fine below half(i have a alum rad). then ill turn the car on and it jumps right back up. the car runs fine. n all. i just think its something with the guage its self. i have checked coolant many times and filled the resivoir tank. so i no it has coolant. and the fan turns on. ne ideas?

 

water temp gauge sending unit is most likely bad

 

Sticky thermostat

 

i say bad sending unit, loose wire on sending unit or bad connection to sending unit.

 

water pump?

 

^ highly doubt that.

 

no. i just changed the motor and it did it with the other one too. im thinking its electrical

 

clogged radiator. do a flush.

 

ne thing else?