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Gene, Auto Service Technician
Category: Car
Satisfied Customers: 4782
Experience:  ASE Master 25 years experience, Ford Trans Tech/SMT, Toyota, Mitsubishi,Hyundai Tech.
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How to change the thermostat in a 1998 ford ranger xlt 4 cylinder 2.

Customer Question

How to change the thermostat in a 1998 ford ranger xlt 4 cylinder 2.5 truck
Submitted: 11 years ago.
Category: Car
Expert:  Gene replied 11 years ago.

Drain the cooling system below the level of the coolant outlet housing.

Click image to see an enlarged view
Fig. 1: Exploded view of the thermostat assembly for 2.3L and 2.5L engines

  1. Disconnect the heater return hose at the thermostat housing located on the left front lower side of engine.

  2. Remove the coolant outlet housing retaining bolts and slide the housing with the hose attached to one side.

  3. Remove the thermostat from the outlet.

  4. Remove the gasket from the engine block and clean both mating surfaces.

It is good practice to check the operation of a new thermostat before it is installed in an engine. Place the thermostat in a pan of boiling water. If it does not open more than 1/4 in., do not install it in the engine.

To install:

  1. Coat a new gasket with water resistant sealer and position it on the outlet of the engine. The gasket must be in place before the thermostat is installed.

  2. Install the thermostat with the bridge (opposite end from the spring) inside the elbow connection and turn it clockwise to lock it in position, with the bridge against the flats cast into the elbow connection.

  3. Position the elbow connection onto the mounting surface of the outlet, so that the thermostat flange is resting on the gasket and install the retaining bolts.

  4. Connect the heater hose to the thermostat housing.

  5. Fill the radiator and operate the engine until it reaches operating temperature. Check the coolant level and adjust as necessary.

Gene and 8 other Car Specialists are ready to help you
Customer: replied 11 years ago.
Thank you for your help!

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