On the 3.1t diesel engine most of the coolant hoses were cracked and had unwanted stuff in the hoses. Some of the hoses were in positions that were hard to replace them. I replace almost all the heater and coolant hoses
around the engine
. I had to cut and fit the hoses to perfectly fit in their proper positions. One of the hoses had a
one way valve. I cleaned the valve out and put it in place with the new hoses. There are some pictures of some of the hoses i replaced.
