Move the Ford Explorer into a well-lit area where you can easily see and reach the engine compartment. Allow the vehicle to cool before you inspect the hoses and clamps so you don't burn yourself during the inspection.
Use your hands to run the full length of each hose. Pay attention to how the hose feels, it should be firm, not soft or pliable. If you feel softness or you can easily pinch the hose with little give, it needs to be replaced.
Pinch the end of each hose and try to feel ridges or gaps inside the hose. Feeling pits or ridges means the hose is failing from the inside and needs to be replaced.
Wipe each hose with a clean white cloth to remove grease and oil so you can visually inspect the hoses. Look for tiny cracks and tears. Replace any hoses that have such defects in them.
Look at each individual clamp. Make sure they're snugly fitted and securely holding the hoses in place but not so tight that the clamps are pinching into the hose. Use a screwdriver to tighten or loosen as needed. Any time you replace a hose in your Explorer, replace the clamps that secure that hose into place at the same time.
Pull the Ford Explorer into an area underneath of which the ground is clean and allow it to run for approximately 5 minutes. Inspect the area beneath the vehicle to see if you can see any evidence of leaking.
Reinspect the hoses to see if you see any moisture or any signs of leaking at the clamps. Adjust or replace those parts accordingly.