Question about 2004 Mazda RX-8
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.
Posted on Sep 10, 2009
Needs taking to a dealer ship,it could be a faulty sensor or connection problem.
Posted on Sep 06, 2009
Am having this problem and the dealer told me it gonna cost me 280GBR (barstards) although someone I know had his RX* coolant cleaned as the sensor had dirt on it and light was constantly coming on. after that no light was coming on again. have a look at "coolant cleaning on Youtube" am just about to do the same and clean mine
Posted on Jul 08, 2013
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Posted on Jan 02, 2017
Tips for a great answer:
----------- Where to Add Coolant? http://repairhelpcenter.blogspot.in/2012/06/2000-daewoo-lanos-where-to-add-coolant.html
------------ Blue Water Warning Light on Dash? http://whatisbyme.blogspot.in/2012/07/blue-water-warning-light-on-dash.html
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