![]() (Credit: ) Your car’s PCM keeps a close eye on both sensors. It might be enough to prevent a catastrophe if you have a serious overheating problem. This P00B7 code shows up exclusively on vehicles equipped with electric thermostats. If the red light comes on and you can't pull over immediately, turn your HVAC temperature controller to full hot and the blower fan to high the heat exchange box serves as an additional (small) radiator and pulls some heat from the engine into the passenger compartment. ![]() I've never seen the red coolant light, which I'm not complaining about. In stop-and-go traffic the temperature fluctuates considerably, from around 175-177F (the highway temperature) to above 200F, when the fans kick on to pull additional air through the radiator and cool the car. Because I can see the actual coolant temperature, I know that my car maintains a very steady temperature on the highway. If the red coolant light comes on, pull over and stop as soon as possible. When the blue coolant light is on (up to approximately 140F), don't thrash the car. If all you have are the warning lights, you still have useful information. There's plenty of room for additional gauges in the (GE8) dashboard but we can't always get what we want or need. I don't need a giant fuel gauge the same size as the speedometer and tachometer. Real gauges for these functions used to be present on most cars. I use an Ultragauge in my Fit to monitor coolant temperatures and the charging system (plus other stuff for fun). ![]()
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