Common Issues with the Plymouth Duster Bypass Hose
A classic vehicle like your Plymouth Duster has probably gone through its share of ups and downs over the years. One of the parts that you'll need to look at though would be the vehicle's cooling system, as various parts would have already worn out over the years. Your Plymouth Duster bypass hose in particular should be checked for signs of leaks and damage. Over time, the rubber material of the bypass hose could turn brittle and crack, so you'll need to have that replaced ASAP. You might even experience a bloated bypass hose, and that could burst anytime soon unless you replace it right away. Most coolant leaks can be traced to a worn out bypass hose, so it's important to check this part whenever you're troubleshooting overheating problems.
Probably the most obvious sign of a worn out bypass hose would be leaking coolant. When your vehicle's thermostat opens the flow of coolant, some pressure may build up from the sudden flow of fluid. The bypass hose prevents too much pressure from building up in the system by allowing some coolant to flow back into the thermostat. But if you have a leak in the bypass hose, the amount of coolant in your vehicle's cooling system will slowly drain, which will then lead to overheating problems. A small puddle of coolant under your vehicle along with a sudden drop of coolant levels would surely point out to a leak. It's best to check your entire cooling system to find the source of the leak as parts other than the bypass hose could be causing the problem. You can't simply patch up a leaking bypass hose since there's a lot of pressure inside of it, so the best solution would be to simply replace it.
Bloated bypass hose
Your vehicle's bypass hose handles a lot of pressure and heat that in extreme cases the hose can actually become bloated. You wouldn't want to rely on a bloated bypass hose as it could rupture at any moment. Unfortunately, there is no remedy for this problem other than replacing the hose entirely. Don't worry, replacing this hose is cheaper compared to the overheating problems that'll you'll have to face if the hose suddenly breaks down while you're out there driving.