Thermostat Removal, Installation, and Test

Thermostat Removal, Installation, and Test

Removal

1. Radiator Cap

1. Wait until the engine is cool, then carefully remove the radiator cap.

2. Vehicle Lift

1. Raise the vehicle on a lift, and make sure it is securely supported.

3. Radiator Coolant - Replacement





1. Loosen the drain plug (A), and drain the coolant.

4. Splash Shield

1. Remove the splash shield (A).





5. Thermostat





1. Disconnect the lower radiator hose (A).

2. Remove the thermostat assembly (B).

Test

Replace the thermostat if it is stuck in the open position at room temperature.

To test a closed thermostat:

1. Thermostat - Test

1. Suspend the thermostat (A) in a container of water. Do not let the thermostat and the thermometer (B) touch the bottom of the hot container.






2. Heat the water, and check the temperature with a thermometer. Check the temperature when the thermostat first opens, and when it is fully open.

3. Measure the lift height of the thermostat when it is fully open.








Installation

1. Thermostat





1. Install the thermostat assembly (A) with new O-ring (B).

2. Connect the lower radiator hose (C).

2. Splash Shield

1. Install the splash shield (A).





3. Radiator Coolant - Replacement

1. Pour Honda Long Life Antifreeze/Coolant Type 2 into the radiator up to the base of the filler neck.

NOTE (Except K24Z7 engine):
* Always use Honda Long Life Antifreeze/Coolant Type 2. Using a non-Honda coolant can result in corrosion, causing the cooling system to malfunction or fail.
* Honda Long Life Antifreeze/Coolant Type 2 is a mixture of 50 % antifreeze and 50 % water. Do not add water.















NOTE (K24Z7 engine):
* Always use Honda Long Life Antifreeze/Coolant Type 2. Using a non-Honda coolant can result in corrosion, causing the cooling system to malfunction or fail.
* Honda Long Life Antifreeze/Coolant Type 2 is a mixture of 50 % antifreeze and 50 % water. Do not add water.
* If the vehicle is regularly driven in very low temperatures (under -31 °F,-35 °C) a 60 % concentration of coolant should be used. To accomplish this, pour 1.6 L (0.4 US gal) of Honda Extreme Cold Weather Antifreeze/Coolant Type 2 into the radiator first, then add Honda Long Life Antifreeze/Coolant Type 2 until the radiator is full.


















4. Maintenance Minder Reset

1. After doing all procedures, select the individual maintenance item you wish to reset with the HDS (See the Maintenance Minder General Information).