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:
Car problem reports
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Most reported Honda Odyssey problems
On certain models moisture can get into the rear wheel bearing and cause a noise. Replacing the rear wheel bearing is needed for this issue.
On certain models the fuel gauge will not read full due to excessive resistance in the sending unit. Replacing the sending unit in the fuel tank will commonly repair this issue.
Sulfur deposits on the fuel sending unit can cause the fuel gauge to read inaccurately. Replacing the sending unit will repair this issue.
A faulty Idle Air Control valve (IAC) can cause the engine to surge and the Check Engine light (MIL) to come on. Replacing the IAC valve will repair this issue.
On some models the power seat can become inoperative when a cable becomes detached. Replacing the cable will fix this issue.
On certain models the rear brakes can groan when coming to a stop. Replacing the rear brake drums may be necessary to correct this issue.
On some models faulty front wheel bearings can cause a growling type noise from the front of the vehicle. Replacing both front wheel bearings is recommended for this repair.
Certain models in colder climates can exhibit a Check Engine light (MIL) when moisture freezes in the Manifold Absolute Pressure (MAP) sensor. Replacing the MAP sensor repairs this issue