My car is saying check coolant level so i put my hood up and there are two reservoirs one says fill while cold and the other says dot3 which one do i put the antifreeze in? Because the one that says fill cold is almost empty

Look in the radiator in the morning when car is cold take off the cap if it is full then look at the reservoir and make sure you see to lines on it one you fill to when cols the other you fill to when how it will say hot and cold fill lines fill yo cold when it is cold then next day check and see when cold if it is at the same mark

WAIT UNTIL YOUR ENGINE IS COLD,YOUR RADIATOR PRESSURE CAP IS LOCATED ON THE COOLANT OVER FLOW RESERVOIR, THATS WHERE YOU ADD COOLANT WHEN COOLANT LOW,YOU POUR COOLANT IN THE OVER FLOW RESERVOIR UNTIL COOLANT LEVEL REMAIN AT FULL COLD MARK DONT OVER FILL OVER FLOW RESERVOIR, WHEN COOLANT LEVEL STOP DROPPING WHEN ADDING COOLANT AND COOLANT LEVEL STAY AT COLD MARK ON THE RESERVOIR YOU RADIATOR HAS THE CORRECT COOLANT LEVEL IF COOLANT LEVEL KEEP DROPPING CHECK FOR COOLANT LEAKS AROUND RADIATOR AND THE TOP AND BOTTOM RADIATOR HOSES, LOOK FOR COOLANT LEAK AT WATER PUMP GASKET OR SEAL OR LEAK AT WATER PUMP WEEP HOLE IF YES REPLACE WATER PUMP.

This can be caused by an insufficient coolant (aka antifreeze) level. Look at the coolant level in the reservoir under the hood. There should be two marks on the bottle "warm" or "hot" and "cool" or "cold". If the engine has been running for a while as in the case when the car has been driven few miles, the coolant level should be up to the "warm" or "hot" line on the bottle. If the car has been parked without the engine running for a couple of hours or more, the coolant level should be at the "cool" or "cold" line on the bottle.

Never remove the radiator cap when hot or if the engine has only been been stopped for less than 2 or 3 hours.

If the hot coolant is at a level that is below the warm or hot line, you should add more of the coolant / water mixture only to the reservoir - not to the radiator. If you are only able to check the coolant level when it is hot - you will have to repeat this procedure until the coolant level of the reservoir is maintained. Checking the hot coolant level can only be done when it has been allowed to cool between hot checks. The cooling period is the only time when coolant is drawn from the reservoir back into the radiator.

If the cold coolant is at a level below the cool or cold line of the reservoir you should add more of the coolant / water mixture to the reservoir and to the radiator, too. Fill the radiator to the top of the neck where the tube from the reservoir connects to it.

If you're still having widely fluctuating temperatures while driving at normal operating speeds, there may be a problem with the water pump, thermostat or other portion of the cooling system.

I hope this helps & good luck!

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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gm put DEX- COOL in the car when it was built, but who know what has been done to it since then so you should probably go get some all makes all models anti-freeze you can get it a any auto parts store.......HAVE FUN

There should be a coolant reservoir under the hood which is labeled engine coolant only. There are marks on the side that state cold and hot level (engine cold or engine hot). Fill to the appropriate level with a pre-mix 50/50 solution from the parts store.

There is a coolant reservoir that is located under the hood. There will be a indicator on the side of it saying full when cold or hot. Fill a 50/50 mixture to the level depending on the vehicle engine temp.

It means your radiator is low on coolant. Not a good thing to leave go. There should be a reservoir under the hood that you put the coolant into. Chances are it has a hot and cold fill level. Check your manual to see if you should use 50/50 coolant or full strength. Fill it to the cold fill level. Drive the car as usual and check it again after a day. It may need to be topped off as some of the coolant will have made it's way into the radiator and coolant stream. It is usual for some of the coolant to evaporate over time so it isn't anything to worry about unless it starts happening regularly. Good luck.

Check your coolant reservoir under the hood. Your water/antifreeze mixture is probably low because with the smart design of this car low coolant first starves the heater core of coolant before the level gets so low that you hurt your engine. Likely you will have to add coolant a few times before the system gets all the air out of the heater core and engine caused by letting it get low, so check a couple of times a day until the coolant level in the reservoir remains at the Max Fill line when checked a few different times. That will signal when the system has removed all the air from the coolant system.

take the rediator cap off and add water there...