One problem related to coolant leaking has been reported for the 2004 Honda Odyssey. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Honda Odyssey based on all problems reported for the 2004 Odyssey.
I kept smelling antifreeze after driving the van but never could find a leak. Finally, I noticed the engine was overheating. Looking carefully, I discovered a coolant leak at head gasket area. While removing head assembly, I noticed two bolts were loose. After removing head assembly from engine block, I discovered stripped threads in one of the bolt holes to hold the head assembly down. A helicoil insert will be used to repair threads before reassembly.