Cooling System: Service and Repair

Fig. 42 Bleeding Cooling System:

1. Set heater temperature control lever to Max. Hot position.
2. Remove radiator fill cap, air relief plug and bleeder cap, Fig. 42.
3. Fill radiator and reservoir take with coolant. Air relief plug is reinstalled once coolant spills from hole during refilling.
4. Reinstall air bleeder cap.
5. Install a suitable steel wire under radiator fill cap to allow coolant to pass into reservoir tank regardless of system pressure.
6. Start engine and raise engine temperature to normal operating temperature.
7. Run engine a 2500 RPM for 10 seconds and return to idle. Repeat two or three times. Watch engine coolant temperature gauge so that engine does not overheat.
8. Stop engine and allow to cool.
9. Fill radiator and reservoir if necessary.
10. Repeat steps 7 through 9 two or three times.
11. Remove steel wire and reinstall filler cap.
12. Raise engine temperature to normal and check for sounds of coolant flow while running engine from idle to 4000 RPM.
13. On GA16DE engines, if sound is heard, repeat steps 5 through 9.
14. On SR20DE engines, if sound is heard, bleed air from system as follows:
a. Allow engine to cool.
b. Remove air bleeder cap on heater inlet hose.
c. Attach a suitable transparent hose at air bleeder pipe and place other end into coolant reservoir tank.
d. Start engine and check for bubbles in reservoir tank.
e. Set heater temperature control lever to Max Cool position.
f. Run engine at 2300 RPM until bubbles disappear. Do not run engine over 2300 RPM because engine damage may occur due to reduced coolant flow.
g. Set heater temperature control lever to Max Hot position and check for coolant flow sounds.
h. If sounds are present, repeat steps e through g.
i. If sounds are not present, allow engine to cool, remove steel wire and hose attached to air bleeder then install air bleeder cap.