* Leaking Condensation: This is the most common cause. The air conditioner system produces condensation, and if the drain is clogged or improperly routed, water can back up and drip into the blower motor housing. Check the AC drain tube (often a small hose or tube exiting the firewall) for clogs. It's usually located near the passenger side firewall area.
* Leaking Windshield: A crack or leak in the windshield, particularly around the base, can allow water to seep into the cowl (the area under the windshield wipers) and then into the ventilation system. Inspect the windshield carefully for any cracks or damage, especially around the seals.
* Leaking Heater Core: While less common, a leak in the heater core can introduce coolant into the blower motor area. This will typically smell sweet (like antifreeze) and you'll likely see a pink or green residue. A heater core leak requires more serious attention.
* Blocked Drain Holes: The cowl area has drain holes designed to let water escape. These can become clogged with leaves, debris, or even ice (depending on climate). Clear out any debris from these holes.
* Sunroof Drain: If your truck has a sunroof, clogged drains can lead to water entering the cabin and potentially reaching the blower motor. Check the sunroof drain tubes.
Troubleshooting Steps:
1. Check the AC drain: This should be your first step. It's the easiest to check and the most likely culprit.
2. Inspect the windshield: Look carefully for cracks or leaks, especially where the windshield meets the body.
3. Check the cowl: Remove any leaves or debris from the cowl area.
4. Smell the water: If it smells sweet, it's likely coolant from a heater core leak.
5. Check the sunroof drains (if applicable): These are often located at the front corners of the sunroof.
If you've checked all of these and still have water, you'll likely need to have a mechanic diagnose the issue. A visual inspection might not be enough to pinpoint the source. The problem may require removing parts of the dashboard to fully assess the situation.
