Low engine coolant, what do you recommend?

Minute coolant loss is normal since some is bound to evaporate out of the system overtime, however if you have to pour a considerable amount of coolant into the vehicle to bring it back to full, then you probably do have a leak somewhere, which is noticeable most of the time. If you have puddles of coolant on the ground beneath your vehicle, then you do have a leak and it needs to be fixed or the problem could eventually compromise the engine. However, if you have an internal leak, that is detectable too when you have a constant plume of white smoke coming out of your exhaust or if the engine is running rough, or if you take off the radiator cap and crank the engine and coolant erupts out of the radiator because of air being pushed through a blown head gasket. However since you didn't not describe any of these symptoms to be present, I think I can rule a coolant leak out. Also, when filling your coolant, the reservoir will normally have a line on the side that says "full cold." That means the cooling system is full at that mark when the coolant is cold. Coolant expands when it gets hot.

As for your check engine light, just so you know in the future, after your warranty expires, you can take your car to most chain auto parts stores like Autozone and they can scan your vehicle for free and tell you what codes you have. Then you can make a decision about what to do from there. However, since your car is still under warranty, go take advantage of it and have the dealer take care of it. That's what warranties are for. Good luck.

If your radiator has a pressure cap make sure it's filled to the top using long life chemical antifreeze from the dealer of the car when the engine is stone cold. When a car has a cooling system leak, fill the plastic cooling system reservoir at least 3/4 full directly after filling the radiator. DO NOT use discount store antifreeze in any car built after 1994. You will plug the cooling system if you do.

You will find the exact type of antifreeze the car should have in the cooling system in the specifications page of your glove compartment manual.

Wish you had taken time to list the year, make and model of your car as many new ones do not have a radiator pressure cap.

Top off radiator and reservior, if you see it leaking the next day then if its under warranty take it in. If it doesnt leak or run low anymore your fine. Coolant does get lost VERY slowly.

Also check oil using the dipstick, if its looks like chocolate milk your head gasket is out, probably not the problem but a quick 30 second check cant hurt.

A lose gas cap could trigger the check engine light.

If it is under warranty have the dealer check it out.

Fill coolant up and kept a eye on it, also when it's setting still like over night, look under vehicle. Look for wet spots, then if there is wet spots, find the leak. You could also have a pressure test it. messing with vehicles 49 yrs

Coolant For Ford Fiesta

Top up with premixed coolant