Small coolant leak today – big expensive bang tomorrow
Sometimes you may have a very small coolant leak and not realize it. For example, you don’t see drops of “anything” under your car, but now, your coolant level light will turn on. You decide to check the level and then add a bit of water, coolant, (or mixture) to “top off” and go on your merry way. From your perspective all looks OK.
Now, if this happens again, and indeed your coolant is low, you really should get your cooling system, hoses, etc..checked by a professional who knows your BMW. Why?
Under the stresses of driving, a very small leak that is not noticeable, can become a big leak at any time, (usually a tiny stress crack that has now grown larger). It could be in the radiator, the hoses, or the plastic expansion tank could just “blow”, to name a few items. This would result in a loss of coolant that would render your vehicle inoperable. (Oh, no! I need my BMW)