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If your coolant level is full the low coolant switch is probably faulty they are normaly just a float & the float might be stuck. & Coolant should be used all year round as it is not just anti freeze but is (Anti freeze, Anti boil, & acidity, alkalinity regulator.) It changes the freezing/boiling point (water freeze at o degrees centegrade & boil at 100 degrees but with glycol it changes this depending on what % glycol there is in the system. The acid/alkaline regulator is corosion inhibitor to prevent parts being eaten from the inside out (radiators, heater cores, welsh plugs etc..)
if you are just adding antifreeze to the cooling system you are safe to use a 50/50 mix that you can get at any auto part store. if you are adding antifreeze to the system after doing a repair ( empty system ) then you will want to get a full ( 100% ) strength antifreeze and add water to it to the correct water/antifreeze ratio depending on the air temp of the area of the world you live in.
under the hood you will see a plastic tank with a black lid.. it should have a coolant word or symbol.. this is where you add water and antifreeze mix, depending on your region as to the percentage of water and antifeeze
Open the radiator drain plug and let out as much coolant as will drain';
Replace drain plug and refill the sytem with distilled water
Run the engine for for few minutes until it is warm (not hot);
Repeat steps #3, #4 and #5 until you've effectively replace all of the
coolant with distilled water. You'll know your finished draining the system
when only clear water drains out.
Drain the system one last time (now only residual distilled water should
be in your cooling system);
**** out all the coolant in the overflow tank (I use a Turkey baster or a
huge syringe with a short length of rubber tubing.)
Replace the radiator drain plug.
Add undiluted anti-freeze to the system;
Run the engine to mix the distilled water already in the cooling system
with the newly added antifreeze.
Check the antifreeze/water concentration with a tester.
Over the next few days, adjust to the desired antifreeze/water mixture
over the next several days. You'll likely have to **** out a little coolant
mixture from the fill cap to create room for either the distilled water or the
anit-freeze you'll be adding to adjust to the desired concentration.
Sometimes I adjust by adding either water or antifreeze to the coolant-
overflow tank which utimately mixes with the engine coolant;
Don't forget to add collant and/or water to the coolant overflow tank.
First the "service engine soon" light is a manufacturer installed reminder for you to get an oil change or other pre-determined maintenance service done. It is different than the "check engine" light which indicates a sensor malfunction. Secondly, when the engine is cold the thermostat is closed and the antifreeze or coolant is not circulating. The cooling system is a closed system and the tank that the cap is on is not an overflow tank but rather an expansion tank. This tank allows for the expanding coolant that is now hot to leave the engine coolant jackets, that won't expand, into a tank that can expand slightly. When your engine got to normal operating temp., aka.. hot, the thermostat opened allowing coolant to circulate and fill the expansion tank probably over flowing with the cap off. This is a normal operation for your car.