Can try a few things. I'm going through a similar issue on my 98 dakota right now. 1. Is the temperature gauge on the dash showing the engine getting warm If not, may be the temperature sensor. Is the electric fan working right. Does it shut off or stay running? There is a relay an fuse for that also. 2. Feel the hoses. They should be rather hot to the touch. In fact, the coolant should be about hot enough to burn you. If after running for awhile they're still cool or just barely warm, I would indeed change the thermostat. 3. If everything feels hot, you could try flushing the heater core. You'll see 2 smaller hoses about the size of a garden hose going through the firewall. They are to your heater core. It may be clogged. Basically you cut the hose and hook a garden hose up to them flushing water through it. If the hose gets stuck on the metal tubes, just cut it off. Don't grip it tight and twist with pliers. Those flimsy metal tubes will collapse then you have a bigger problem.
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