* Heater Core: This is the most likely culprit. The heater core is a small radiator located inside the dashboard that warms the air for the cabin. If it develops a leak, antifreeze will drip onto the floor, often on the passenger side.
* Firewall Leak: A crack or hole in the firewall (the metal barrier between the engine compartment and the passenger compartment) could allow antifreeze from a leaking hose, fitting, or component in the engine bay to seep into the cab.
* Leaking Hose or Connection: A compromised hose or connection near the firewall, especially on the passenger side, could drip antifreeze onto the firewall and eventually into the cabin.
* Water Pump Leak: While less likely to directly reach the passenger compartment, a major water pump leak could potentially lead to antifreeze finding its way through various routes into the cabin, especially if combined with other factors like a compromised firewall or poorly sealed floor.
It's crucial to avoid driving the truck until the leak is identified and repaired. Continuing to drive with a leak can lead to overheating, engine damage, and potentially serious health consequences from inhaling antifreeze fumes.
To diagnose the problem:
1. Visual Inspection: Carefully inspect the engine bay, focusing on hoses, connections, and the water pump. Look for any signs of antifreeze residue or wet spots. A flashlight and a mirror might be helpful.
2. Pressure Test: A mechanic can perform a pressure test on the cooling system to pinpoint the exact location of the leak.
3. Check the Heater Core: This often requires partially disassembling the dashboard, so it's best left to a mechanic.
Don't attempt major repairs yourself unless you have significant automotive experience. This type of leak requires professional diagnosis and repair to ensure safety and prevent further damage.
