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Q:

no heat on 2002 Dodge Grand Caravan

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
fan only blows on high and even when van is totaly warmed up very little to no heat comes out
(1) Answer
Sounds like multiple issues here. With regard to the fan speed only working on high, it is probably a bad blower resistor pack. With the weak heat, this could be caused by several things. My first concern is that there is not enough coolant in the system, which would not keep coolant flowing consistently through the heater core, thereby leaving not very hot air from the vent. This is a dangerous condition as you can potentially overheat and damage your water pump and/or engine.