One problem related to coolant leaking has been reported for the 2003 Dodge Grand Caravan. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Dodge Grand Caravan based on all problems reported for the 2003 Grand Caravan.
Tubes carrying coolant to the rear heater rusted through, causing coolant to leak out of the system. Repair was not covered by extended warranty. Have spoken with other caravan owners that have had the same failure. Some were covered under warranty. Have read on numerous forums 1) about this same failure on multiple model years (1999 - 2005) 2) how the bracket material is different than the tube, thereby causing galvanic corrosion 3) how Chrysler has since changed the material of the tubes to reduce the possibility of galvanic corrosion. The repair (tube replacement) is relatively expensive, but potentially more so if there is complete drainage of coolant, causing engine/transmission failure.