Am I due for a round of part replacements as I'm about to hit 100K miles? I replaced my MAF sensor a week ago, and this morning my LOW COOLANT light came on. I replaced the UIM in April, so theoretically any coolant leak was fixed. My overfill tank was at about the house line, and I had some quick fill so I was able to fill it up. But I haven't seen a leak, and my oil didn't look gooey or that any coolant was in it.