I have the coolant buzzer, so I took a look first at the sensor.

Everyone seems to say the coolant sensor is somwhere under the filler cap, but my Haynes manual says it is on top of the radiator... anyway

So I unclipped the wire just in front of the coolant sensor on top of the radiator and grounded the wire directly (the sensor was stil plugged in). The buzzer did not shut off, so chances are the problem is an electrical issue somewhere before the sensor.

But I can't follow that wire, it disappears; tapped with other wires.

I saw an unplugged green wire with a black stripe near the filler cap though and I can't find where it should go.

Any clue?
Thanks guys

 

it should be on top of the radiator...there is also a coolant sensor on the back of the waterpump housing but that doesn't affect the buzzer IIRC.

 

Thanks! so that is narrowed. But since I grounded the wire directly (not the sensor) and still have the buzzer; it means the problem is somewhere in the wire. Does anyone know where it goes?

 

The single female butt connector near the water pump is for a rad fan switch for cars equipped with the electric auxiliary fan.

RE: Coolant sensor - Chapter 15 (Body Electrical), page 42. Grounding the wire to the sensor should cause the light/buzzer to turn off/silence. But it may take a few seconds. Try grounding it with ign off, then start it up and wait a bit.

 

The wire is part of the front body harness. It follows the harness down the driver side frame rail into the firewall at the driver side.

 

You're sure it's the low coolant warning, and not low oil? If your warning lights work, it'd be obvious which it is, but if not, they both use the same buzzer.

 

I actually thought grounding the wire would stop the buzzer while buzzing... it turned out grounding it shut it off when the ignition was first turned off.
So I guess I'll bleed the system and hope for the best! Cause I don't see any kind of leak in there and the coolant level is far from being low!

Yes I'm positive it is the coolant buzzer: the light is turned on.

 

The warning buzzers and lights are a good thing... But i hate it when they go off still freaking stops my heart for a second... You never know if its a big deal or just a tad low.

 

The coolant sensor will cause the buzzer to come on, if it does not see water in the radiator for 10-13 seconds.

The buzzer and light will go off, if the wire is put to ground, within a second. No more. No less.

There's no trick to this. If the key is ON or better the buzzer will come on in 10-13 seconds if the sensor does not see water and the buzzer will go off if it sees water within one second or will go off if you gnd the wire.

If you grounded the brown wire and the buzzer/light didn't come on, then there is probably an open in the circuit. You can prove that one way or the other. Put the key to ON. Measure the voltage at the brown wires terminal that connects to the sensor. It should read approx a half volt dc.

If it does not, the find the connector b/t the sensor and the gauges called FME-01, and find out where the wire is open. It's either b/t the combination meter and FME-01 or b/t FME-01 and the sensors terminal.