I recently was given my mom's 1989 190e 2.6. I'm going through the car to make sure it will be reliable. I noticed that the small hose (approx 2" long) that goes from the thermostat housing to the cylinder head is in bad condition. It looks like it's about to let go in fact. Is this easy to change? The thermostat housing looks like it won't move, and the cylinder head certainly won't. If I remove the old hose is it possible to slip a new one in, or does the thermostat housing/waterpump need to be removed?

Thanks

Pete