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Why does the ADD COOLANT light come on in my "83 Rx7 when the radiator resuvour is full?

The light comes on mostly when it's cold then pops off as it warms up, I'm in L.A. so its not freezing

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Posted on Jan 02, 2017

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SOURCE: coolant in coolant reservoir did not fill low level in radiator

you must drain air out of system
so when engine is warmed up, just unscrew slightly the thermo time switch which is the highest sensor and unit in cooling system besides the reservoir, until alittle air releases then when antifreeze starts coming out then retighten to specs. BE VERY CAREFUL !!!! LOOSEN VERY SLOWLY AND NOT COMPLETELY REMOVE FOR THIS CAN CAUSE BURNS. MIGHT WANT TO USE A RAG AROUND SENSOR. If this doesnt solve it then make sure you have the correct rad. cap. Also that the filling hose is not clogged as well as the little port on radiator.

Posted on Feb 19, 2009

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SOURCE: low coolant light is on with full radiator

Check the coolant top up reservoir. Low coolant sensor is usually in the overflow/reserve container.
Wash out and clean any dirt or corrosion from the sensor prong.
Refill to correct level with fresh coolant, then recheck alarm operation.

Posted on Jul 17, 2009

  • 1986 Answers

SOURCE: Low Coolant light comes on, popped hood and

You're mixing coolant and oil. Probably lower intake gasket leak if you're not running hot, otherwise could be head gasket or other issue. Occasionally a cracked core in the radiator will do this too.

You need to have it taken care of, if you have oil in the coolant, you've also got coolant in your oil, the engine will begin to eat itself...

Posted on Oct 16, 2009

  • 416 Answers

SOURCE: the low coolant light comes on but the radiator

may be a bad coolant level sensor

Posted on Jan 31, 2010

  • 1608 Answers

SOURCE: low coolant light keep coming on. radiator full

The problem is the low level sensor.It is just below the radiator fill neck.About 3 or 4 inches down on the passengers side.It is held in by a wire clip.The best way to replace it is to let the cooling system cool down so there is no pressure build up.There is an o-ring for a seal.What I do is lube the o-ring seal before installing the sensor so it goes in easier and the o-ring will not slide off.You can partially drain the coolant just below the sensor level or just remove the sensor and install the new one.You will loose a very slight amount of coolant if your quick enough.You should be able to get one at any part store and it should not cost to much.You can call ahead to the part stores and tell them your make and model number along with the engine size.I hope this helps and good luck.

Posted on May 29, 2010

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Welcome to Fixya

You need to add few ounces of coolant to the reservoir. The reservoir is located under the hood. It is a white plastic that has liquid in it. Please see picture below of the coolant reservoir.
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Thank you for using Fixya!

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I replaced my radiator on my 2004 with a 2.2 and it seems like the thermostat is not opening. It can not get the air out. It seem to just to over heat and push the coolant out. Randy


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