Question about 1987 Mazda RX-7

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Coolant Sensor My coolant sensor (one of the top ten annoying sounds on earth) keeps going off and wont shut off even though coolant level is full. How can I just kill it.

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Just unplug that **** lol

Posted on Apr 12, 2009

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Someone I knew had a 2001 Impala with the same exact problem. We fixed it temporarily by taking a pitcher full of water and dumping it into the coolant tank. Keep doing this until you can maybe get a new sensor, or find a way to disable it? But just warning you, disabling things ANYWHERE in an engine might be needed at the least expected times...

Hope I can help, if not I am sorry and I hope your RX7's sensor is repaired soon.

Posted on Mar 29, 2009

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OMG!!! I know that sound all to well I hear it in my nightmares sometimes. You can just short it to ground by clipping the end off, crimping a "O" terminal on the wire and screwing a self tapping screw any where out of sight (as long as it's screwing into sheet metal). Usually it's an air pocket in the top of the radiator that causes it to go off, but due to the laid back angle of the radiator you need a pressurized filler to get it completely out. If you wanted you could take the gauge cluster out and remove the siren also. You can still monitor the coolant via the temp gauge so theres really no reason for the **** air raid siren of doom any longer.

Posted on Feb 04, 2009

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I hope that I've been of assistance and that you soon resolve your problem. Don't put it off, as a simple £5 sensor protects you from a potential four figure repair bill.

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there is no reset for the low coolant light. the light will remain illuminated until the coolant is topped up. if the coolant level is ok, and the light is still on, there is a problem with either the level sensor or the wiring - more likely the sensor. good luck!

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1. Unplug the sensor harness from the bottom of the coolant bottle.

2. Find a large paper clip and use needle nose plyers to make a "staple" shaped jumper that is about 1/4 inch wide (about the distance between the two contacts on the harness) and about 3/8 inch long.

3. push the jumper you just made into the end of the harness connector.

4. Start your car and ensure that the warning is no longer displaying. You can also insert the jumper while the car is running (be careful, the coolant bottle will be hot) because the harness is removed from the sensor the coolant warning should already be displayed. When you insert the jumper the message should go away imediately. The coolant level sensor has only one job and that is to tell the computer when coolant is low so you don't have to worry that you may be causing any other problems by doing this. If the coolant light doesn't go away you may have a break in the wire somwhere or a bad connection to the jumper.

5. If all works well, use electrical tape to seal up the end of the harness so moisture doesn't get in. Also it's a good idea to secure the harness to something nearby so that it doesn't flop around when you are driving.

All done. Sorry this was long but I hope that it helps someone. That warning really has been irritating me.

Keep in mind that this method does disable a key safety device that is designed (poorly) to warn you in the even of a coolant leak. Keep an eye on your temperature gauge and check your coolant level regularly. Get the bottle replaced when you can.

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