Turn the master On-Off valve OFF.
Remove the cover from the water relay valve.
Remove and inspect the water relay diaphragm.
(a) If there is no defect in the diaphragm, reassemble and test the
(b) If it is defective, replace the water relay diaphragm. Reassemble
and test the valve.
c. Air Bubbles in the Coolant Water. Refer to figure 5-4.
(1) Determine if there is a defective O-ring on the connector tube at the
syringe terminal. Refer to 5-2a(1) above.
Determine if there is a defective water regulator. Refer to 5-2a(2) above.
Figure 5-4. Water valve cross section.