What to do when low coolant light comes on?

This tightening of coolant leads to lighting up of low coolant sensors. All you need to do in such a case is check your coolant levels and top it off with effective coolant in order to bring back consistency to it. You could either top it off by yourself or let your mechanic do the job for you.

When does the coolant warning light come on?

When the engine coolant is cold, the coolant level sensor triggers the warning light. As the coolant heats up with the engine, it expands raising the level. Check coolant levels when the engine is completely cold and top up if necessary. This is not applicable if the coolant warning light is blue.

Why does the low coolant sensor come on and off?

But when the low coolant sensor turns on and off no matter what the season is, you may have several questions in mind. The first step towards addressing the issue starts with inspecting the coolant levels. If that is not the case, then the following reasons could help you know better. 1. Sensor Malfunctioning

Why does the coolant light go on when the tank is full?

Your problem also be a faulty coolant level module. Check the wiring to be sure nothing is loose or corroded. These are some of the possible causes of a coolant light going on when the tank is full. You’ll want to take your vehicle to a qualified repair location to diagnose and repair your problem if you can not easily diagnose it yourself.

Can a PCM turn off a low coolant light?

Yes. If the light goes out then the switch is bad. If not then you could possibly have an open wire and the pcm isn’t seeing that the switch is closed thus keeping the light on. A multi-meter can tell you if a wire is open. Yes.