My truck has been disabled due to a huge HPOP oil leak for about two months. It is offseason for racing, so thankfully I have not needed the truck. I had time to fix the leak on Saturday only to leave it with a small fuel leak.
When I parked the truck there were no temperature issues. The truck would sit on the "R" in NORMAL or down on the "O" if I was babying it. My first test drive after fixing the oil leak resulted in temps around the "L". This was unusual, but I did have my car hauler hooked up. I had a car on the hauler on Sunday and the temps were past the "L" but still under the red marker and "H". Also, the needle has a tendance to "dance". It will jump from the "L" to about half way between "L" and "H" and slowly creep back down.
The only outstanding circumstances are that the water pump seemed to be leaking last summer. I wasn't sure if it was the neck on top or the weep hole that was leaking. I changed the entire neck, thermostat and oring. The leak from the neck stopped, and I would have the occasional leak from the pump still. I top my coolant supply and add additive (and test) as necessary. After the neck/coolant change the truck temps were fine.
My inclination is to replace the water pump. I'm wondering what you guys think. Should I change the sender first in case it is bad? Ideas?
Thanks in advance.