Acura_MDX_2001-2006

Thermostat

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Removal & Installation



2001-02 Models

For thermostat replacement, refer to the accompanying illustration.

Click image to see an enlarged view

Fig. Exploded view of the thermostat-2001-02 models

2003-06 Models

NOTE
Make sure you have the anti-theft codes for the radio and navigation system, then write down the audio presets. Make sure the ignition switch is OFF.

  1. Disconnect the negative cable from the battery first, then the positive cable.
  2.  
  3. Remove the battery.
  4.  
  5. Drain the engine coolant as follows:
    1. Turn the ignition switch ON (ll). Set the displayed temperature on the climate control system to 90°F (32°C), then turn the ignition switch OFF. Make sure the engine and radiator are cool to the touch.
    2.  
    3. Remove the radiator cap.
    4.  
    5. Loosen the drain plug, and drain the coolant.
    6.  
    7. Install a rubber hose (A) on the drain bolt (B) located at the rear of the cylinder block, then loosen the drain bolt.
    8.  
    9. When the coolant stops draining, tighten the drain bolt.
    10.  
    11. Tighten the radiator drain plug securely.
    12.  
    13. Remove, drain, and reinstall the coolant reservoir.
    14.  

  6.  
  7. Remove the thermostat cover, then remove the thermostat.

    Click image to see an enlarged view

    Fig. Exploded view of the thermostat and related components-2003-06 models

  8.  

To install:

  1. Install the thermostat with a new rubber seal.
  2.  
  3. Install the battery. Clean the battery posts and cable terminals with sandpaper, then assemble them and apply grease to prevent corrosion.
  4.  
  5. Fill the radiator with engine coolant and bleed the air from the system, as follows:
    1. Pour Acura Long Life Antifreeze/Coolant Type 2 (P/N OL999-9001) into the radiator up to the base of the filler neck.
      NOTE
      Always use Acura Long Life Antifreeze/Coolant Type 2 (P/N OL999-9001). Using a non-Honda coolant can result in corrosion, causing the cooling system to malfunction or fail. Acura Long Life Antifreeze/Coolant Type 2 is a mixture of 50 % antifreeze and 50 % water. Do not add water.


      NOTE
      The engine coolant capacities (including the reserve tank capacity of 0.6L (0.16 US gal)): After coolant change: 7.1L (1.88 US gal). After engine overhaul: 9.0L (2.38 US gal).

    2.  
    3. Start the engine. Hold the engine speed at 1,500 rpm until it warms up (the radiator fan comes on at least twice). Make sure the thermostat is open.
    4.  
    5. Turn off the engine. Check the level in the radiator, and add Acura Long Life Antifreeze/Coolant Type 2, if needed.
    6.  
    7. Set the climate control or heater control panel to maximum cool. Start the engine. Hold the engine speed at 1,500 rpm for 5 minutes, then turn off the engine.
    8.  
    9. Check the level in the radiator, and add Acura Long Life Antifreeze/Coolant Type 2, if needed.
    10.  
    11. Set the climate control or heater control panel to maximum heat. Start the engine. Hold the engine speed at 1,500 rpm for 5 minutes, then turn off the engine.
    12.  
    13. Check the level in the radiator, and add Acura Long Life Antifreeze/Coolant Type 2, if needed.
    14.  
    15. Set the climate control or heater control panel to maximum cool. Start the engine. Hold the engine speed at 1,500 rpm for 3 minutes, then turn off the engine.
    16.  
    17. Check the level in the radiator, and add Acura Long Life Antifreeze/Coolant Type 2, if needed. Set the climate control or heater control panel to maximum heat. Start the engine. Hold the engine speed at 1,500 rpm for 3 minutes, then turn off the engine.
    18.  
    19. Check the level in the radiator, and add Acura Long Life Antifreeze/Coolant Type 2, if needed.
    20.  
    21. Repeat the previous 3 steps until the coolant level does not change in the radiator, then install the radiator cap loosely.
    22.  
    23. Set the climate control or heater control panel to maximum cool. Start the engine. Hold the engine speed at 2,500 rpm for 1 minute.
    24.  

  6.  
  7. Clean up any spilled engine coolant.
  8.  
  9. On 2003-06 models, perform the power window unit reset procedure. Resetting the power window control unit is required after performing the following procedures:

    Disconnecting the battery.
     
    Removing the No. 8 (20 A) fuse from the under-hood subfuse box.
     
    Disconnecting the 18P connector from the power window control unit.
     
    Removing the window regulator, glass or glass run channel.
     
    Disconnecting the driver's door wire harness.
     

    1. Turn the ignition switch OFF.
    2.  
    3. Turn the ignition ON (II).
    4.  
    5. Lower the driver's window all the way down by pushing the driver's switch to the second detent (AUTO DOWN) when the window reaches the bottom, hold the driver's window switch in the AUTO DOWN position for 2 seconds.
    6.  
    7. Raise the driver's window all the way up without stopping by pulling the driver's switch to the second detent (AUTO UP) when the window reaches the top, hold the driver's window switch in the AUTO UP position for 2 seconds.
    8.  
    9. If the window does not work in AUTO, reset the power window control unit according to the above procedure again.
    10.  

  10.  
  11. Enter the anti-theft codes for the radio and the navigation system, then enter the audio presets. Set the clock.
  12.  

 
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