I have a 99 F150 4.2 liter. temp gage show redline but engine is not over heated. let it run in my garage for 20 min in the red and then I shut her off and turned her back on; gauge went to normal position. fuses look good. I cant seem to locate my temp sending unit though. there is a plug to the right of my thermostat housing but can locate where the unit is!!!!

 

I looked in a service manual and only saw a temperature sending unit on the 4.6L...it is located on the front of intake on the right hand side.

The 4.2L has a head temperature sensor on the rear of the left hand head. I am sure someone else will be of more help.

 

would that be rear driverside head? thanks for the quick response!!

 

Yes. When considering vehicle handedness, always think of it as you are sitting in the vehicle. i.e. left hand = driver's side. Not sure if it is the sensor that ties to your light/gauge.

 

thanks!! will keep looking!

 

Does anyone have a pic on where the temp send unit is on my '99 4.2L F150? thanks !

 

It's on the intake manifold, close to the thermostat.

 

Thanks! man Really appriciate it!! checked it out but my actual problem was a stuffed up radiator. got it flushed, and all that good stuff. my baby is cool as a breeze now! thanks!