Re: Engine Light - Thermostat or Cooling Sensor?
You know, I've been reading about this very issue in different places. For a while now, and especially since moving to NC, I've noticed that my temp is doing the same thing that others are seeing.... Very low temperatures, and very occasionally, the P0128 code. My ScanGauge is reading an operating temp of about 172 F, and the dash gauge barely gets off Cold.
One article I came across mentioned that the coolant may be losing its composition or breaking down. I've got about 145K on the truck and haven't changed the coolant yet! (I know, I know.. Bad owner! In my defense, things have been HELLA busy around here.. getting married, moving, new job, etc tend to take up a ton of one's time!) Well, this weekend, I'm planning on doing a coolant flush.
Has it been decided that replacing the thermostat fixes this issue? I doubt seriously that it's a fan issue. Most of the time, I'm seeing the CEL while doing 60 down a highway, early morning, heading to work! I'll clear it with ScanGauge and it doesn't come back for quite a while.
Black Betty is long gone...
'07 Jeep Grand Cherokee Overland (It's got a HEMI!)