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Re: how to disconnect connector to coolant level sensor...
Wires/plug attached to bottom of coolant bottle for level meter..corroded likely..you may need to do more than disconnect it though.. test power/ground there... it may need to be wired into itself to satisfy idiot light on dash
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The red square shaped warning dash light is an image of a crudely drawn radiator indicating that you are low on coolant. Topping up your coolant bottle reservoir located on the passenger side above the wheel should clear up your issue. If your coolant level is full and is still indicating low coolant via dash warning light, you could possibly have a sensor out in the radiator or air bubbles in your coolant lines that need to be bled out.
You can simply replace or unplug the sensor. Unplugging it should turn off the warning light and won't affect anything. The sensor is usually located on the passenger side of the radiator. It is hard to see it but its there!
If you disconnect the sensor and the light goes off, make sure no other warning lamps light up, and then you will have to check the coolant level yourself.
It's very likely you have a bad coolant level sensor.
This sensor is in the coolant reservior. In some cases you may get the same warning if the reservior is overfilled, make sure the level of coolant only goes up to the, " FULL " line on the reservior.
If you locate the water expansion tank (front of the bonnet, opened, with the pressure-cap to top-up if necessary) - check that there's sufficient coolant in there (check whilst the engine is cold).
If so, you may be suffering the same problem as a lot of RX8 owners, with a dodgy coolant level sensor in the tank. One way to confirm this is to remove the connector to the tank - on the left-hand side of the tank as you look from the front (not the air-conditioning connector, immediately to the left of it, attached to an aluminium billet). Ensure the (now free-hanging) connector from the wiring loom is safely stowed and give it a test drive. If you're satisified that the warning goes away then you know that the level sensor in the tank is faulty (and therefore the warning light is spurious). Unfortunately, that's a pricey item to replace (dealer price, UK, in the region of £200).
Remember, leaving the coolant sensor unplugged to avoid the spurious warnings would mean that a genuine problem that resulted in (catestrophic) loss of coolant would then go undetected, until too late. So do this at your peril.