Coolant leaks coming from the underbody on vehicles equipped with rear heat/AC are common. The underbody hoses should be inspected as part of regular maintenance. If you drive on roads where salt is prevalent the problem is generally more severe. Some 2005 models are involved in a special service action, no government recall was issued.
2002 Dodge Grand Caravan Problem Reports
RepairPal Verified 2002 Dodge Grand Caravan Problem Reports
Shifting harshness and shuddering issues related to the operation of the automatic transmission have been addressed by factory service bulletins. The shuddering can feel like the vehicle is being driven over rumble strips.
The auxiliary heater hose connections (that are routed to the rear heater under the vehicle) can develop coolant leaks.