Changed the thermostat, the adgulator (misspelled maybe) and the front panel control for the heater where you control the hot and cool air. I stopped trying for about two weeks, turned it on one day and it got hot. When the weather got hot, I moved it over to the AC and it hasn't heated up since then.
SOURCE: 97 dodge grand caravan 3.8l little heat and then goes away
sounds like you need a new heater core
SOURCE: 2001 Dodge Caravan heater blows cold air when stopped
Have you checked the coolant level? What you describe is exactly what happens if the coolant level is low. When stopped at idle, hot coolant is not circulating through the heater core, so no heat. As the engine increases in rpm's when you pull away from the light, the water pump is spinning quicker, and some coolant is making it to the heater core. So check the level, and if it is low, keep an eye on it to see if it drops again. That of course indicates a leak somewhere. Get it fixed, as overheating the engine leads to costly repairs and worse case a new engine. Let me know how you make out with this.
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