CLK 320 P0115 Engine Coolant Circuit Malfunction
 

Correction on my eailer Post.... Confirmed the Code and it is in fact P0115 not P0150. Which as I understand is the Engine Coolant Circuit Malfunction.

My question is, is it safe to drive? Is it as simple a buying a part that I could replace myself, or is it necessary to take to a repair shop.

Any idea as to the cost of the part or cost from a repair shop?

Really have enjoyed the site. Thanks for the information.