Where is the petcock to bleed radiator on a 1995 Ford Aerostar van?

The 1995 Ford Aerostar doesn't have a petcock specifically for bleeding the radiator in the traditional sense. Instead, bleeding the cooling system is usually done by opening the radiator cap and running the engine until the thermostat opens and air is purged from the system. There might be a small bleeder valve on the engine block or heater hose, but it's not a common feature, and its location would vary depending on the engine type (3.0L Vulcan or 4.0L Cologne V6).

To bleed the cooling system on a 1995 Ford Aerostar, you should:

1. Ensure the engine is cool: Avoid burns!

2. Locate the radiator cap: This is usually on the top of the radiator.

3. Remove the radiator cap: Be cautious as the system might still be pressurized.

4. Add coolant: If the coolant level is low, add the correct type of coolant/antifreeze mixture to the radiator.

5. Start the engine: Let it run until the thermostat opens (the engine should reach operating temperature). You'll likely see the coolant level in the radiator change.

6. Check for air bubbles: Watch for any air bubbles escaping from the radiator. If bubbles are present, it's likely air is still being purged. You may need to add more coolant as it purges out.

7. Top off coolant: Once the engine is at operating temperature and no more bubbles are visible, and the radiator is full, replace the radiator cap.

If you're still having trouble after this process, there might be a more significant problem with the cooling system, and it's best to consult a mechanic. A repair manual specific to your 1995 Ford Aerostar (with the engine type specified) would be very helpful in identifying any additional bleeder valves or specific instructions.