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Coolant warning light comes on when idling and goes off when driving

There is a light for the coolant in my synergie, do I use water or something else...

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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alicantecoli
  • 22326 Answers

SOURCE: Warning lights for oil and also for coolant are coming on

new engine¿?

Posted on Nov 18, 2008

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csmock132
  • 4669 Answers

SOURCE: red warning light - check engine

You need to have it scanned to see what code turned on the light.

Posted on Feb 27, 2009

  • 10 Answers

SOURCE: Coolant light

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

ministock48
  • 258 Answers

SOURCE: oil light comes on at idle, goes off when driving, oil level full

change oil pressure switch it' should be near the oil filter

Posted on Dec 25, 2009

Testimonial: "That confirms what I thought. Thank you, you guys are great. "

  • 1796 Answers

SOURCE: 2001 Aurora water pump replaced

On the Owner's Manual there's a procedure you have to follow to bleed the air in the cooling system, until you bleed the system for air, the low coolant light will come on every time.

The process is rather simple and quick, all you need is a flat head screw driver.

DO NOT OPEN THE COOLING SYSTEM WHEN HOT.

Good Luck!! Don't forget to rate this post!!

Posted on Sep 03, 2010

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3 Answers

Coolant light


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.

Sep 05, 2009 | 2004 Mazda RX-8

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