* Clear or slightly yellowish: This could indicate coolant (antifreeze) from a leak in the heater core. Heater cores are notoriously prone to failure in older vehicles and are located behind the dash, often leaking onto the passenger floor.
* Brownish or reddish: This might be brake fluid, indicating a leak in the brake lines, master cylinder, or wheel cylinders. This is a serious safety issue and requires immediate attention.
* Dark brown or black: This could be motor oil, suggesting a leak from the engine or transmission. This is less common to leak directly onto the passenger floor, but possible depending on the location of the leak and how the van is constructed.
* Greenish: This points towards power steering fluid. Similar to engine oil, this isn't usually a direct leak to the passenger floor, but it's possible.
* Smells sweet: This strongly suggests coolant.
Possible sources regardless of fluid type:
* Leaking heater core: As mentioned above, this is a very common culprit in older vehicles.
* A/C condensation: While not strictly a leak, excessive condensation from the air conditioning system can drip onto the floor, especially if the drain is clogged. This is usually watery and doesn't smell strongly of anything.
* Sunroof drain: If your Astro has a sunroof, a clogged drain can cause water to overflow into the interior.
* Windshield seal: A leak in the windshield seal can allow water to enter the cabin.
* Weatherstripping: Worn weatherstripping around doors or windows can allow water ingress.
What to do:
1. Identify the fluid: This is the most important step. Collect a sample (if possible safely) and compare it to known fluids (check your owner's manual for color references).
2. Inspect the area: Carefully examine the passenger-side floor, carpeting, and undercarriage for signs of the leak's origin. Look for wet spots, staining, or dripping.
3. Check under the dash: Look for evidence of leaks near the heater core.
4. Check for obvious leaks: Inspect hoses, connections, and components under the hood and beneath the vehicle.
5. Take it to a mechanic: If you cannot identify the source of the leak, a mechanic can diagnose the problem and perform the necessary repairs. This is especially important if the fluid is brake fluid or coolant, as these leaks pose safety risks.
Ignoring a fluid leak can lead to serious mechanical problems and safety hazards. Addressing it promptly is essential.
