low coolant level
 

The coolant lever light comes on 2006 cls500. The shop said not low on coolant. When I run A/C for awhile,A/C stops blowing cold. I turn off and wait awhile and turn back on it blows cold,then it will happen after some time. Is the warning low coolant and A/C problem related?

I doubt the two problems are related. One affects the engine temperature while the other affects your comfort. It's likely the coolant level sensor in the expansion tank is faulty and needs to be replaced. A reputable shop, or a MB dealer, would have recommended a fix instead of simply stating "not low on coolant". Not sure what the problem is with your A/C system.

I agree with Ferdman. Find another "shop" and yes most likely the level sensor. Also probably time to look at the hoses, the color of the overflow tank (if dark brown, change it), new coolant and the thermostat. Your car is now 9 years old.
Anziani
'97 Cl600 56K

the coolant level sensor wears out/goes bad replace it should be good to go

also replace thermostat they wear out long before 9 years