1. On the coolant/temperature issue, what is the temperature gauge indicating?
2. I'd go back to the place that changed out the TPMS sensors and let them reset it, or replace it as required. Sometimes those things take a "time-out" and then start working again.
3. The fluid changes color primarily due to heat or water absorption. You could remove/replace some of it with a turkey baster. I would use DOT 4, which is better than, but compatible with DOT 3.
2. I'd go back to the place that changed out the TPMS sensors and let them reset it, or replace it as required. Sometimes those things take a "time-out" and then start working again.
3. The fluid changes color primarily due to heat or water absorption. You could remove/replace some of it with a turkey baster. I would use DOT 4, which is better than, but compatible with DOT 3.