RTStork
Explorer Addict
- Joined
- September 23, 2001
- Messages
- 1,174
- Reaction score
- 0
- City, State
- Grand Bay, AL
- Year, Model & Trim Level
- 99 Explorer XLT 5.0L 2WD
Heres the deal. The Explorer can idle all day and the temp will stay in the lower half of the temp guage but when you start driving it and get on the hwy the temp will slowly start to creep up and get near the hot mark on the gauge. It has a new thermostat, coolant, hoses. The clutch fan seems fine but even if it was bad wouldnt it get hotter at idle but cool down on the highway? The only things I can come up with is the water pump or a clogged radiator, but I would think it would run hot all the time. Its not losing any coolant either. So, what would cause a vehicle to only run hot on the highway but not at idle? This is completely opposite of any cooling problems I have dealt with in the past. The climate is starting to get warmer, so it will surely overheat once summer arrives.