Vehicle Questions and Answers
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Water collecting in the passenger side floor area of your Honda Civic is often due to a potential blockage in the AC evaporator drain hose, leading to condensation backup and leakage into the car cabin. Should the leakage occur primarily during rainy weather, it may indicate faulty weatherproofing around the doors and windows. It's also possible that what appears to be water is actually coolant resulting from a malfunctioning heater core, which tends to be the priciest issue to resolve among these possible causes, with parts typically costing $150 to $280 and labor considerably higher at an estimated range of $550 to $700.
A wet carpet or water on the floor of the passenger side could be caused by a clogged air conditioning condensate drain tube or a faulty heater core leak.