Automotive Heating – Thermostat

The engine thermostat is a component that requires replacement as part of routine maintenance procedures. Follow the steps below when replacing the thermostat.

Replacing the Thermostat

1. Drain the engine coolant into a drain pan.
2. Remove the necessary hose connections from the thermostat housing.

After draining the coolant into a drain pan, the upper radiator hose constant tension clamp can be moved back for the removal of the hose. A pair of slip-joint pliers work well when removing the hose

A small pick with a 90-degree bend is effective to aid in breaking the hose loose from its mounting

The pick is being used to help break the hose loose from the thermostat housing. Care should be used to make sure the hose is not punctured during this process if it will be reused. If the hose is going to be replaced, then the hose can be cut with a razor or a knife to assist in the removal

3. Remove the fasteners for the thermostat housing and then remove the housing from the mounting location.

After removing the hose from the thermostat housing, it should be moved out of the way to allow access for fastener

The fasteners for the thermostat housing can be removed once the upper radiator hose is removed and the connector is removed from the coolant

A ratchet, an extension, and a 12-mm flexible socket is used to remove the fasteners for the thermostat housing. The flexible socket allows for much greater access in locations that have limited

4. Remove the thermostat and compare the original unit to the new unit to make sure the new item will fit the engine.

After the fasteners for the thermostat housing are removed, the housing can be lifted up from the mounting location. The sealing surfaces will need to be thoroughly cleaned before installing a new gasket during the installation

The old thermostat can be lifted from the mounting area by hand. The correct thermostat is placed in the same location facing the same direction as the old

5. Install the new thermostat along with a new gasket for the housing.

After installing the new thermostat, the thermostat housing is installed using a new gasket. The fasteners for the thermostat housing should be torqued to the correct tightness using a torque wrench. The radiator hose can be installed firmly into place and then the hose clamp can be

6. Install the fasteners for the thermostat housing and tighten them to the correct torque.
7. Install the hoses back into place on the thermostat housing.

A close inspection should be performed to make sure that all items are reconnected and firmly in the correct place before refilling the cooling system with

8. After closing the radiator drain valve, refill the cooling system with the correct type of coolant.

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