Blue low engine coolant temperture indicator light is on

It can be faulty coolant temperature sensor.Its not sensing exact coolant heat temperature so its overheating then required level.

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Get the coolant pressure tested, its definitely leaking coolant. You will need to get the coolant running line.

Pressure test will help you to know from where exactly coolant/refrigerant is getting leaked.

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For complete step by step troubleshooting i suggest you to go through the help links mentioned below :----

Click the link below :-----

Coolant enters in transmission on Toyota Land cruiser?

http://schematicsdiagram.blogspot.com/2012/01/coolant-enters-in-transmission-on.html

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1991 Toyota Camry: Order Coolant Bypass Tube?

http://whatisbyme.blogspot.in/2012/05/1991-toyota-camry-order-coolant-bypass.html

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2002 Toyota Camry: Puff of Blue or White Smoke while Starting?

http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html

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1994 Toyota Camry: Coolant Leak?

http://technoanswers.blogspot.in/2012/04/1994-toyota-camry-coolant-leak.html

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2006 Cadillac DTS: COOLANT LEAK AT DRIVER SIDE NEAR FIREWALL?

http://schematicsdiagram.blogspot.in/2012/04/2006-cadillac-dts-coolant-leak-at.html

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MAF, IAT, MAP and Coolant Level Sensor problem all together on Mazda MPV?

http://schematicsdiagram.blogspot.com/2011/12/maf-iat-map-and-coolant-level-sensor.html

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GMC Engine Coolant Temperature (ECT) Sensor Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-engine-coolant-temperature-ect.html

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Loosing Coolant?

http://whoisbyme.blogspot.in/2012/06/loosing-coolant.html

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Coolant temperature sensor dies again and again?

http://schematicsdiagram.blogspot.com/2012/01/coolant-temperature-sensor-dies-again.html

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2000 Daewoo Lanos: 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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Replacing Oldsmobile Engine coolant sensor?

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How to test Engine coolant temperature sensor?

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Replace Coolant Sensor Module on Oldsmobile?

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These details will help.

Thanks.

Make sure there is no air in the system, take the radiator cap off and let the engine idle for half an hour, as the air comes out the coolant will go low, ad more coolant and then close the cap on also make sure the resevour bottle is at its mark.

i used to get the blue light but now it is not coming ON at all even at -12C. Any idea what could be the issue?

I had this on my 2002 Yaris, with 103,000 miles on the clock. I found that the rear engine mounting rubber bush was partly torn and the charcoal cannister was loose (not inserted in bracket properly). I installed a used rear engine mount off e-bay, straightened the cannister bracket and inserted it properly. Knocking noise at low revs now sorted.

Manual states that when the fluid is cold it will show up blue then as it wanrms up it goes away. a normal function. It's in the owner manual somewhere.

toyota did some good research years ago .. they found that anti freeze that contain silicates caused excessive wear in the water pump seals .. most antifreeze at that time contained silicates .. so toyota developed their own type .. and they charged a lot for it .. it was red in color .. it was designed to last a long time and cut seal wear to a minimum (no silicates) .. so it was a good idea to use their super antifreeze .. now almost all antifreeze can mix with other types but do you reallly want to contaminate the expensive stuff already in your car with something that might contain silicates .. in this case toyota has a good reason for recommending certain types of antifreeze .. of course they used to recommend only their own brand but i hope that has changed .. i would use only long life antifreeze that is recommended by toyota or that states "contains no silicates" .. even buying their expensive stuff isnt so bad since it lasts so long and the echo uses so little. .. i am not sure what the new long life antifreeze contains ... did they ever address that problem ?..

either a leaky head gasket or someone put oil in the overflow, it happens, clean it out drain the coolant from the entire system and refill with new long life antifreeze, also add a can of good radiator sealer.

our alternator is not charging that why all our light on get it check out pierre

You should get the problem code ran at a shop or auto parts store. My moms 2003 Toyota Echo check engine light came on and it had a slight misfire, I replaced all the sparkplugs about $20 and no check light.

Hope this was helpful

Check your coolant level first then start having sensors checked. Could be a bad sensor or wiring issue.