Coolant buzzer going off and your Coolant is full? Look inside...
 

This is a question I see pop up a few times a week I see a lot of people having issues with the coolant buzzer going on and staying on as soon as the turn the car on and(this is key) they have verified that they are topped off at the filler neck. The most common reason for this(at least 90% of the cars that I have fixed) is the connector on the wire has become loose or disconnected close to the AC/PS/Front Rotor Housing by the spark plugs. It is a single black wire. I do not have a picture of what it looks like since I am currently deployed, but look/feel around... you'll find it. Many times if you have recently changed your spark plugs you may have knocked it loose.

I see alot of people saying to just ground the sensors out. This is the wrong answer. Take some time and find the issue. If you have verified that the connector is in fact plugged in, post here with your questions and we will do our best to help out :)

Brent

In my experience, I see this as a fuller cap/burp issue.

As stated above... buzzer stays on all the time when coolant is toped off. A burp issue means that sensor is doing it's job and the owner should fill up the filler neck above the sensor.

With the issue stated above, the buzzer comes on as soon as the car is powered on and does not go off. If it has air in the system, once the system is hot it will purge the air to the top and drop the coolant level below the sensor, thus kicking the buzzer on.

I have had a couple of the sensors fail, I think a new one from malloy is around $13-15.00.

I've also seen a few with the wire broken right at the sensor. It's gets snagged while working in the area, or just fatiques and breaks with heat and age.

I've got a similar issue with my FC. I'll have to check the other end of the wire.

I'm havin the same issue. As soon as turn on the car the buzzer goes off and will not stop until I'm going over 60 mph. I have checked the coolant and the sensor wire but no cigar. What else can I do????

coolant topped off means nothing, i had this exact issue did lots of research purchased this awesome funnel, followed directions and fixed all my problems.... here it is

http://ecx.images-amazon.com/images/I/31Qvny2HXwL.jpg