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How do you replace the thermostat on a 1998 Ford Ranger 4 cylinder?

Step 1: Gather the tools and parts.

- Replacement thermostat

- Thermostat gasket (if not included with new thermostat)

- 5/16-inch wrench

- 3/8-inch socket wrench

- Extension bar

- Funnel

- Coolant (type specified in owner's manual)

- Rags or paper towels

Step 2: Drain the coolant.

- Locate the drain plug on the bottom of the radiator.

- Place a drain pan under the plug.

- Open the drain plug and allow all of the coolant to drain out.

Step 3: Remove the thermostat housing.

- Locate the thermostat housing on the front of the engine.

- Remove the two bolts holding the housing in place.

- Lift the housing off of the thermostat.

Step 4: Remove the old thermostat.

- The thermostat is located in the center of the housing.

- Use the 5/16-inch wrench to loosen the bolts holding the thermostat in place.

- Lift the old thermostat out of the housing.

Step 5: Install the new thermostat.

- Place the replacement thermostat in the housing with the spring facing up.

- Install the bolts that hold the thermostat in place and tighten them with the 5/16-inch wrench.

Step 6: Reinstall the thermostat housing.

- Replace the thermostat housing gasket, if necessary.

- Reinstall the thermostat housing and secure it with the bolts you removed earlier.

Step 7: Refill the coolant.

- Use the funnel to fill the radiator with coolant.

- Add coolant until the radiator is full.

Step 8: Start the engine.

- Start the engine and let it run for a few minutes.

- Check for leaks around the thermostat housing.

- If there are no leaks, turn off the engine and wait for it to cool down.

- Reinstall the drain plug once the engine has cooled.