Yeah, since the r170 platform is over 20 years old now MB no longer has to keep making parts to support it. There is a coolant hose that goes from the back of engine block to the heater core that I just found is discontinued. I found a used one and have ordered it and hope it will work, mine had developed a nasty leak and was leaking coolant from the rear of the engine down the trans and blowing back under the car.