Question about 2003 Toyota Highlander

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Coolant level in 03 highlander seems low

When cold, level is below the ''low'', covering only about an inch or two of the overflow tank. i drove it about 3 miles to the dealer where it registered above the low line. the dealer said it was fine, the further i drive, the higher it will go. i had the radiator flushed and filled in oct. 08. prior to that the level was never below ''low''. do i need to add more coolant or are they actually telling me the truth? all the new cars in the dealership have their reservoirs at the ''full'' mark. thankyou.

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The safest thing it to add more, you don't want to run it below the mark at all. this can cause damage in the intensive heat.

Posted on Mar 07, 2009

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How do u check coolant cold. The manual says running temp but I don't want to burn my nose in the dark just trying to see the level with flash light.


What type of vehicle do you have John,om your overflow coolant tank,should have two levels,hot and cold,if the tank is empty,then remove radiator cap and see how much is in radiator,add if low then put cap back on,then add to your overflow tank,plus you have a leak somewhere,may be your water pump is leaking,find the water pump,crawl under vehicle and see if fluid is leaking their.Do all this when engine is cold.

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My dashboard LOW COOLANT light came on, I had the radiatior flushed, and the light is still blinks


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If insuring the engine has the proper level of coolant doesn't correct the low coolant light, the next step would be to replace the sensor. In most engines it is just a screw-in plug with a wire on it that transmits to the low coolant gauge in the dash. Most automotive part stores should be able to look up where it is located. It is like changing a spark plug, but you may loose a little coolant out of the engine when you remove the old one, so check the coolant level after changing it.

Good Luck!

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1 Answer

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