BobsYourUncle wrote:
Don't overlook something as simple as plugged cooling fins on your rad. There is usually 2 or 3 things out front, the rad being the innermost. Your A/C condenser will be in front of the rad, and then a tranny oil cooler if you have one.
Are you cleaning a lot of bugs off your windshield over the past couple years? If so, those same bugs could be plugging things up through the grille, restricting air flow.
Take a peek through the front to see if there is a lot of schmoo in there.
We had an issue a few years back with the radiator fan often coming on even when driving on level ground. A check of the front side of the A/C condenser and radiator fins disclosed a lot of gunk and white fluff (cottonwood tree fluff maybe?) was blocking the fins. A flush from the back side cleared most of it off and resolved the issue. I took some pictures at the time but can't find them now.