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Just had this done today on my Passport. Remove the Moonroof and you will see 4 holes. 2 in the front on each side and 2 in the back on each side. Blow out the holes with an air hose (you will need a fitting on the end that will fit into the holes) then blow out each hole. When you finish, you can check to see if they are draining properly (keep Moonroof off when checking) very carefully pour water around each hole until you hear the suction. This should work.

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Q: How do you clean the moon roof drain channels on a 1999 Honda Passport After heavy rain water backs up and comes in to the car?
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