Last night, while driving home from work, my 2003 F-150 (5.4l) coolant gauge started dropping out and returning.
We've had a heat spell here and the ambient temp was about 95*. This happened AS SOON AS my fan clutch kicked in (I know this as my transmission temp gauge will be at 190* before the clutch kicks in)
My coolant gauge never went above its normal range, it just cut in/out between op temp and cold.
It was behaving as if there was a short of some sort.
I got home, let my truck sit for about an hour and a half then took it back out. The coolant and trans temps had both cooled to about half and the gauge did not act up for a whole 3 mile drive.
*EDIT* I forgot to mention that my coolant level is within the normal range and there are no signs of leaks
Thanks in advance1 AnswerFord9 years ago