See Figures 1, 2 and 3
The cooling system should be inspected, flushed and refilled with fresh coolant at least every 30,000 miles (48,000 km) or 24 months. If the coolant is left in the system too long, it loses its ability to prevent rust and corrosion.
When the coolant is being replaced, use a good quality antifreeze that is safe to be used with aluminum cooling system components. The ratio of antifreeze to water should always be a 50/50 mixture. This ratio will ensure the proper balance of cooling ability, corrosion protection and antifreeze protection. At this ratio, the antifreeze protection should be good to -34°F (-37°C). If greater antifreeze protection is needed, the ratio should not exceed 70% antifreeze to 30% water.
See Figures 4, 5 and 6
When checking the coolant level, the radiator cap need not be removed. Simply check the coolant level in the recovery bottle or surge tank.
Check the coolant level in the recovery bottle or surge tank, usually mounted on the inner fender. With the engine cold, the coolant level should be at the FULL COLD level. With the engine at normal operating temperature, the coolant level should be at the FULL HOT mark. Only add coolant to the recovery bottle or surge tank as necessary to bring the system up to a proper level.
On any vehicle that is not equipped with a coolant recovery bottle or surge tank, the level must be checked by removing the radiator cap. This should only be done when the cooling system has had time to sufficiently cool after the engine has been run. The coolant level should be within 2 in. (51mm) of the base of the radiator filler neck. If necessary, coolant can then be added directly to the radiator.
COOLING SYSTEM INSPECTION
Checking the Radiator Cap Seal
See Figure 7
While you are checking the coolant level, check the radiator cap for a worn or cracked gasket. If the cap doesn't seal properly, fluid will be lost and the engine will overheat.
Worn caps should be replaced with a new one.
See Figures 8 and 9
Periodically clean any debris; leaves, paper, insects, etc. from the radiator fins. Pick the large pieces off by hand. The smaller pieces can be washed away with water pressure from a hose.
Carefully straighten any bent radiator fins with a pair of needle nose pliers. Be careful, the fins are very soft. Don't wiggle the fins back and forth too much. Straighten them once and try not move them again.