Q: sudden loss of coolant

Hi Felicity. Thanks for sending in your question today. Assuming that your Chrysler 300 did not overheat previously and coolant is leaking internally, it’s quite possible that your radiator cap has failed. This will cause coolant to escape in the method in which you are describing. However, it’s also possible that you had too much water mixed with coolant, and that the water has evaporated from the mixture when the engine temperature rose. It’s supposed to be a 50/50 mixture of coolant to distilled water. It’s hard for us to tell you - yes or no - whether your car is safe to drive, without knowing the actual cause of this problem. I think the best option here is to have a professional mobile mechanic complete a coolant leaking inspection, so they can determine if there is damage to the coolant system or if the radiator cap simply needs to be replaced.