How often should I be replacing coolant? I just had some work done about 2 months which involved replacing the expansion tank, and I happened to notice today when I checked that it was low. I know it was full 2 months ago. I don't notice it leaking on driveway or anywhere on the engine. Any suggestions?

 

cant be good, check for leaks... minor leaks overtime this happens... i just had my expansion tank replaced for the 2nd time

 

It took 4 times for the dealership to find all the coolant leaks in my car. Expansion tank and a hose.

 

I took my car to my local service guy for a coolant change, he noticed the coolant was low and found a leaky water pump. The car's at the dealer now getting the pump replaced under my extended warranty @ 72K miles.