hello i have a problem with my 2007 ford f150 with a 4.6l. When ever i start the truck up the temperature gauge will not move from the cold marker not matter how long i drive it for. i changed the thermostat and flushed the system twice. after doing that the temperature gauge will still not move until i drive the truck then turn it off and back on. when i turn it back on it will read normal op temperature. but this only happened once when i pressed the gas the truck started to over heat it only got the the 3/4 line but after slowing down and re pressing the gas it did not happen again. it is not leaking coolant the fan works and i changed the oil and there was no signs of coolant in the oil. thank you for your time and any help

 

it sounds like the thermostat and cooling system might be working, but you have an electrical problem between the sending unit and the dash gauge ?........ I would look at the temp sensor on the motor and see that the wire is connected... Im not sure which way the sensor works, but with the wire OFF you will push the temp gauge to max or min, and with the wire GROUNDED to the motor, the gauge should read the opposite max or min........ If it does that, then replace the sensor.. IF not, then the wire or dash gauge is still a problem.

 

do you know where the temp senor is located i cant find seem to find it. all i can find is you have to pull the alternator and its somewhere behind there.

 

it is on the passenger side head, near the alternator as you said........ NOT drivers side.

 

after pulling the alternator there was nothing on the passenger side of the head i only saw the one on the driver side

 

In 2007 I believe there is no traditional coolant temperature sensor. Instead they use the cylinder head temperature sensor which is located on the back of the driver's side cylinder head.

 

turned out to be the entire cluster assembly went out. thanks for the help