It might be normal. Presure builds up in the cooling system when driving so it can look like it's below L. Best way to check the level of the coolant would be on the cold engine or to carefully let the pressure out of the system buy slowly turning the reservoirs cap. WARNING! If the pressure is in the system and engine is hot it might burn your hands or something else so be really careful and turn the cap really slowly and stop as soon you hear fizzling. after it stops fizzling turn the cap a little bit more and do this little by little till all the pressure is out
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