* Radiator: The upper and lower radiator hoses are the most prominent. The upper hose connects the engine to the top of the radiator, and the lower hose connects the bottom of the radiator to the engine. These are usually large diameter hoses.
* Engine: Several smaller hoses connect to the engine itself. These might connect to the thermostat housing, water pump, heater core inlet/outlet, and possibly bypass hoses. These are often located near the front and sides of the engine block. Look closely around the thermostat housing – it's a common place for leaks.
* Heater Core (inside the passenger compartment): These hoses run through the firewall and into the passenger compartment to the heater core. You will NOT see these from under the hood; access is through the interior. Leaks here will result in fluid on the passenger floor.
* Expansion Tank (Reservoir): There's usually a hose connecting the expansion tank (overflow reservoir) to the engine. This allows coolant to be drawn back into the system as it cools.
To find them effectively:
1. Consult a repair manual: A Chilton's or Haynes repair manual specific to a 1991 Ford Explorer is your best bet. These manuals will have diagrams showing the exact location and routing of all the hoses.
2. Look for discoloration or evidence of leaks: Check for any signs of coolant leaks (white or greenish residue) along the hoses. This can help pinpoint their location.
3. Trace the hoses from the radiator: Start at the radiator and follow the hoses to see where they connect.
Remember safety first! The coolant in your Explorer will be hot if the engine has recently been running. Let it cool down completely before working on the system. Also, wear appropriate safety glasses.
