On the 3.3l engine in my 1995 Intrepid the coolant return line has a rigid pipe section that runs under the exhaust manifold on the driver's side - pretty sure it is the return line vs the supply line. It has been really rusty for a long time. I have cleaned it and painted it with rust paint / rust primer a few times when working around it. Course it always rusts up again with the temperature swings and exposure it has. I have debated if I should proactively replace it with a heater hose - it does not have to run under the manifold - I could reroute the hose I think. The pipe feels solid enough - have yanked on it - but I am concerned this thing is going to spring a major leak one day and leave me limping home (or worse one of the kids gets stuck with it / overheats the engine...). Anyone have any experience with these - are they good and solid and never fail or are they known for regular replacement. I have about 390,000 km on the car now (200+kmiles) and plan to keep it running for a few more years. Thanks.