Cooling System - Refilling And Bleeding - Winnebago 1987-1989 LeSharo Service Manual

COOLING SYSTEM
REFILLING • BLEEDING
• Prepare a
SO/50
mixture of anti-freeze and
water prior to filling.
• Check that the hoses and the drain plug in the
cylinder block are tight.
• Open the bleed screw on the heater core.
• Open the heater valve.
• Unclip the expansion bottle and support it as
high as possible.
• Fill the cooling system through the expansion
bottle.
• Close the bleed screw as soon as coolant flows
out.
• The coolant level in the expansion bottle
should be about 25% full (cold).
• Place the cap on the expansion bottle.
WARNING
Be careful to keep hot coolant from contacting
the eyes or skin. Always wear protective
eyewear and clothing.
Bleeding
• Run the engine until the thermostat opens and
let it continue to run a few minutes.
• Open the bleed screw on the heater core. Close
it when coolant flows out without any trace of
air.
• Mount the expansion bottle.
• Recheck that the coolant level in the expansion
bottle is correct after the engine has cooled
down completely.
Coolant level in expansion bottle
Cold - 25% full
Hot - 50% full
Vehicles Equipped with Rear Automotive Heater
and/or Motoraid Water Heater
The air bleeding procedure is identical to the
previous directions, however extreme care must
be exercised to insure that all air has been purged
from the rear system. The rear heater valve must
be opened for at least 50% of the time during the
air bleeding procedure to insure that all lines are
bled. Elevating the front of the vehicle and
shutting off the dash heater will assist air
bleeding.
E-6
WARNING
The coolant level must be repeatedly checked
and filled as necessary after bleeding the system
to ensure that all air has been purged. Failure to
do this may cause overheating which could
result in serious engine damage.
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