The heater core is like a small radiator.
Wet under car mat.
If the damp carpet is under a car mat remove the mat after checking to see if it contains any moisture or mold.
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This makes it easier to clean safer to walk on your concrete and keeps your belongings dry.
Step 3 remove the mold.
Causes of a wet passenger side floor mat 1.
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Our technicians have found three things that most often explain wet interior floor mats and footwells.
Everything that falls off your car stays in one place.
Continue this procedure until there is very little moisture remaining in your carpet.
Hot coolant flows from the engine where heat is absorbed and taken to the car s heater core when you turn on the heater.
In the winter or even wet spring weather you pull in and the moisture dirt and debris goes everywhere.
A wet floor mat or carpet can develop mold mildew and other odorous issues.
Bad heater core a similar problem could occur with the car s heater system.
Heat under your floor mat comes from the exhaust pipes and causes moisture trapped in the carpet to steam and collect on the bottom of the mat.