Cooling System; Secondary Air Supply System - Honda GL1800 Service Manual

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Using coolant with silicate corrosion inhibitors may

cause premature wear of water pump seals or

blockage of radiator passages. Using tap water may

cause engine damage.

Check to see if there are any coolant leaks when the

coolant level decreases very rapidly.

If the reserve tank becomes completely empty, there

is a possibility of air getting into the cooling system.

Be sure to remove all air from the cooling system

COOLING SYSTEM

Remove the radiator grilles (page 6-9).

Check for any coolant leakage from the radiator

hoses and hose joints.

Check the radiator hoses for cracks or deterioration

and replace if necessary.

Check that all hose clamps are tight.

Check the radiator air passage for clogs or damage.

Straighten bent fins with a small, flat blade screw-

driver and remove insects, mud or other obstruc-

tions with compressed air or low pressure water.

Replace the radiator if the air flow is restricted over

more than 20% of the radiating surface.

Install the radiator grilles and removed parts

(page 6-13).

Remove the air cleaner housing (page 5-57).

Check the air supply hoses between the pulse sec-

ondary air injection (PAIR) control solenoid valve

and PAIR check valves for damage or loose

connections.

deterioration.

If the hoses show any signs of heat damage,

inspect the PAIR check valves (page 5-72).

For PAIR control solenoid valve inspection, see

IR SUPPLY HOSES