Under the wiper arms on your Jaguar is the fresh-air intake for the heating and A/C system. This area is designed to collect rainwater and route it safely away through small drains known as cowl drains. When these drains are open and intact, water exits harmlessly into the engine bay.
Over time, leaves, dirt, pine needles, and road debris can clog the cowl drains. When this happens, rainwater backs up and can enter the cabin through the HVAC intake. The result is often water under the dashboard, wet carpets, and even soaked floor mats after a heavy rain or car wash.
The cowl drains are located in the engine compartment at the base of the windshield, near the wiper arm area. They should be inspected regularly, especially if your Jaguar is parked outdoors or under trees.
If a drain is cracked, broken, or missing, it must be replaced. Properly functioning cowl drains are critical to keeping water out of the HVAC system and the interior.
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DIY Inspection & Cleaning Checklist
This simple check can prevent serious interior water damage:
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Open the hood and locate the area below the windshield near the wiper arms.
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Visually inspect the cowl area for leaves, dirt, or standing water.
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Locate the drain outlets in the engine bay and ensure they are present and firmly attached.
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Clear debris by hand or with compressed air (use low pressure).
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Flush with water to confirm proper drainage — water should flow freely and not back up.
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Inspect the drain tubes for cracks, splits, or missing sections.
Perform this check at least once or twice a year, and anytime you notice water inside the car.
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Symptoms of Clogged or Failed Cowl Drains
If your cowl drains are blocked or damaged, you may notice:
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Wet carpet or floor mats, especially on the front passenger side
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Water dripping from under the dashboard
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Musty or moldy smells from the HVAC system
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Fogging windows that are difficult to clear
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Sloshing sounds behind the dash after rain
Left unchecked, water intrusion can damage carpets, wiring, control modules, and HVAC components.
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Why This Matters
Clogged cowl drains are one of the most common—and most preventable—causes of interior water leaks on Jaguars. A few minutes of inspection and cleaning can save you from electrical issues, corrosion, mold, and expensive interior repairs.
Bottom line:
Clean, intact cowl drains keep rainwater where it belongs—outside your Jaguar. Add this task to your regular DIY maintenance routine and avoid the dreaded “wet feet” surprise.
Cowl drain parts at Jagbits.com
