A refrigerant leak may develop from the AC evaporator causing the AC to blow warm air. Verifying failure of this component is difficult. A good shop will use leak detection dye to verify a failing evaporator.
Problems for specific Honda Odyssey years:
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Most reported 1995 Honda Odyssey problems
Evaporators can collect mold and give a foul smell. The evaporator will have to be disinfected or replaced to repair this issue.