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.
Problems for specific Dodge Grand Caravan years:
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Most reported 2003 Dodge Grand Caravan problems
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.
Intermittently, the key may not start the car or release from the ignition. If it is excessively worn, replace the key. If the new key doesn't work, replacing the lock cylinder including tumblers should correct this concern.
An oil leak from the oil filter adapter may be evident. Dodge has made a revised oil filter adapter is available.
If the HVAC (heater) housing is not properly sealed at the bulkhead (firewall), water can leak into the passenger compartment. Foam sealant should be used to seal any gaps and the evaporator drain tube can be modified to prevent further water entry.
The rear lift gate support (prop) attaching bolts may break, causing the lift gate to fall unexpectedly. Thorough inspection of the bolts is required; if the support washers are loose, the supports need to be replaced.
A moaning or fog horn sound may be heard while turning at a slow speed. Installing a finned power steering cooler will help alleviate the problem, but it may be necessary to replace the power steering rack.
A failing head lamp switch can cause the head lamps and/or instrument cluster lighting to flicker or dim. The head lamp switch should have a noticeable click between each position; a "mushy" feel is a strong indication of a failing switch.
Hood misalignment, cowl cover misalignment, wiper module drain tube(s), and/or the lower plenum drain hose may cause the HVAC housing to leak water onto the passenger side floor. Diagnoses will be required to confirm the location of a water leak in the front passenger area.
While turning in either direction during low speed parking lot maneuvers, if a creaking, squawking, squeaking, grinding, or groaning sound is heard from the front strut area, locate the front strut dust boot and rotate the dust boot side to side. If the sound is present, applying lubricant to the jounce bumper (bump stop) of both front struts can help with the noise.