epec

Hi, I have a 2000 nissan altima, recently I found the water temperature gauge has some problem. When I drive it on the road, the meter keeping jump from middle and cool position, it is definitly annoying. I an not sure it is problem of wire connection, thermostate or the cooling system. Any suggestion on it? I tried to fasten the cable connection around the thermostate and thermal transmitter, but it does not work.

RodC

I've got the same problem with my 2003 Frontier. 2.4 liter 4 cylinder - only it really does overheat then cool down when I keep it under 60mph. I had the thermostat changed and the coolant changed. No good. Don't know what to do next. The warranty is out already.

epec

I read through the internet, people said it may be the problem of thermal transmitter (or coolant temperature sensor). There is a connection we can find around the radiator, the problem may be there, I will go to find it out

Vandy-1

Could be some air in the system that needs to be bled out , but also check the sender to see if it is faulty.It is located by the upper rad hose.

Max96

Its the Temp Sending Unit, this sends the signal to the guage. the connection has a short most likely... pull it off and inspect wire. its right up front where the upper radiator hose connects to the head. Worse case scenario, change the unit.