Checking The Thermostat

THERMOSTAT

EAS26450
                                                           2. Check:
CHECKING THE THERMOSTAT
                                                            • Thermostat housing
1. Check:
                                                              Cracks/damage → Replace.
 • Thermostat
                                                           3. Check:
   Does not open at 71–85 °C (159.8–185.0 °F)
                                                            • Thermostat hoses
   → Replace.
                                                            • Thermostat pipes
                                                            • Radiator inlet hose
                                                            • Thermostat cover/radiator filler pipe
                                                            • Plunger control unit hose 1
                                                              Cracks/damage/wear → Replace.
                                                           EAS26490

                                                           INSTALLING THE THERMOSTAT
                                                           ASSEMBLY
                                                           1. Install:
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
                                                             • Copper washer New
a. Suspend the thermostat “1” in a container “2”             • Coolant temperature sensor
   filled with water.
b. Slowly heat the water “3”.                                              Coolant temperature sensor
                                                                            18 Nm (1.8 m·kg, 13 ft·lb)
c. Place a thermometer “4” in the water.
                                                                  T.
                                                                      R.

d. While stirring the water, observe the thermo-           EC3P61019

   stat and thermometer’s indicated tempera-               CAUTION:
   ture.                                                   Use extreme care when handling the coolant
                                                           temperature sensor. Replace any part that
                                                           was dropped or subjected to a strong im-
                                                           pact.
                                                           2. Install:
                                                            • Thermostat “1”
                                                            • Thermostat housing “2”
                                                           NOTE:
                                                           Install the thermostat with its breather hole “a”
                                                           facing up.

                                                                                              a          1

  A. Fully closed
  B. Fully open                                            3. Fill:
                                                            • Cooling system
NOTE:                                                         (with the specified amount of the recom-
If the accuracy of the thermostat is in doubt, re-            mended coolant)
place it. A faulty thermostat could cause serious             Refer to “CHANGING THE COOLANT” on
overheating or overcooling.                                   page 3-25.
                                                           4. Check:
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲                            • Cooling system
                                                              Leaks → Repair or replace any faulty part.

                                                     6-8
                                                      THERMOSTAT

5. Measure:
 • Radiator cap opening pressure
   Below the specified pressure → Replace the
   radiator cap.
   Refer to “CHECKING THE RADIATOR” on
   page 6-3.

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